| 401 | arid | extremely dry |
| 402 | aristocrat | one of a ruling class, a noble |
| 403 | armada | a fleet of warships |
| 404 | armful | the amount an arm or arms can hold |
| 405 | armistice | a formal agreement to end fighting |
| 406 | armory | a place where arms (weapons) are kept |
| 407 | aroma | smell (usually in relation to food) |
| 408 | arouse | to evoke or awaken a feeling, emotion or response |
| 409 | arraign | to officially charge someone in a court of law |
| 410 | arrange | to set up, to organize, especially in a positive manner |
| 411 | arrangement | the act of arranging |
| 412 | arrant | complete, total |
| 413 | arrear | work to be done, obligation |
| 414 | arrogant | haughty, conceited |
| 415 | arrogate | assume, take or claim (something) without justification |
| 416 | arroyo | a small watercourse, usually dry except for heavy rains |
| 417 | arsenal | a collection or supply of weapons or munitions |
| 418 | artesian | pertaining to a well in which water rises from pressure |
| 419 | artful | performed with, or characterized by, art or skill |
| 420 | arthurian | of or relating to the legend of king arthur |
| 421 | articulate | express (an idea of feeling) fluently and coherently |
| 422 | artifact | an object made or shaped by humans |
| 423 | artifice | a crafty but underhanded deception |
| 424 | artisan | a worker in a skilled trade |
| 425 | artless | having or displaying no guile, cunning, or deceit |
| 426 | ascendant | rising, moving upward |
| 427 | ascent | the act of ascending a motion upwards |
| 428 | ascertain | to find out definitely, to discover or establish |
| 429 | ascetic | a person who practices severe self-discipline |
| 430 | ascribe | to attribute a cause or characteristic to something |
| 431 | aseptic | free of disease-causing microbes |
| 432 | asexual | having no distinct sex, having no interest in sex |
| 433 | ashen | of the pale gray color of ash |
| 434 | asinine | foolish, unintelligent or silly |
| 435 | askance | turned to the side, especially of the eyes |
| 436 | askew | turned or twisted to one side |
| 437 | asperity | harshness of tone or manner |
| 438 | aspersion | an attack on somebody's reputation or good name |
| 439 | aspiration | ambition, goal |
| 440 | aspire | to hope or dream, especially towards a profession |
| 441 | assail | to make a concerted of violent attach on |
| 442 | assailant | someone who attacks or assails another violently |
| 443 | assassin | to assassinate |
| 444 | assay | to examine or analyze |
| 445 | assent | to agree to, give approval to |
| 446 | assert | to state a fact or belief confidently and forcefully |
| 447 | assess | to determine, estimate or judge the value of, to evaluate |
| 448 | assessor | one who assesses a property for tax evaluation |
| 449 | asset | something or someone of any value |
| 450 | asseverate | to declare earnestly, seriously, or positively, to affirm |
| 451 | assiduous | diligent, industrious |
| 452 | assignee | one to whom a thing is assigned |
| 453 | assimilate | to take in and incorporate as one's own |
| 454 | assonance | the repetition of similar or identical vowel sounds |
| 455 | assonant | having successive similar vowel sounds |
| 456 | assonate | to correspond in (particularly vowel) sounds |
| 457 | assuage | make an unpleasant feeling less intense |
| 458 | assurance | a declaration tending to inspire full confidence |
| 459 | astound | to overwhelm with amazement |
| 460 | astral | relating to or resembling the stars, starry |
| 461 | astringent | sharp, caustic, severe |
| 462 | astute | shrewd, sharp |
| 463 | asunder | apart, divided |
| 464 | asylum | a place of safety |
| 465 | atheist | of or relating to atheists or atheism, atheistic |
| 466 | athirst | thirsty |
| 467 | athwart | across, crosswise |
| 468 | atomizer | an instrument for reducing a liquid to spray or vapor |
| 469 | atone | to make reparation, compensation, or amends, for an offence |
| 470 | atrocious | frightful, evil, cruel or monstrous |
| 471 | atrocity | an extremely wicked or cruel act |
| 472 | atrophy | to wither or waste away |
| 473 | attache | an official associated with an embassy |
| 474 | attain | to accomplish, to achieve |
| 475 | attainment | the act of arriving at or reaching |
| 476 | attenuate | to reduce in size, force, value, amount, or degree |
| 477 | attest | to affirm to be correct, true, or genuine |
| 478 | attribute | to ascribe (something) to a given cause, reason etc |
| 479 | attrition | wearing or grinding down by friction |
| 480 | atypical | not conforming to the normal type |
| 481 | auburn | of a reddish-brown colour |
| 482 | audacious | showing willingness to take bold risks, recklessly daring |
| 483 | audible | capable of being heard |
| 484 | audit | an official verification of records, especially financial |
| 485 | audition | a trial to test a performer's suitability for something |
| 486 | auditor | a person appointed to examine accounting records |
| 487 | auditory | of, or relating to hearing |
| 488 | augment | to make bigger |
| 489 | augur | to foretell events, to exhibit signs of future events |
| 490 | augury | a divination based on the behaviour of animals |
| 491 | august | inspiring reverence or admiration, majestic |
| 492 | augustinian | pertaining to st. augustine of hippo |
| 493 | aura | distinctive atmosphere or quality associated with something |
| 494 | aural | of or pertaining to the ear |
| 495 | aureole | any encircling ring of light, halo |
| 496 | auricle | the outer ear or pinna |
| 497 | auriferous | containing or producing gold, gold-bearing |
| 498 | aurora | an atmospheric phenomenon creating bands of light in the sky |
| 499 | auroral | pertaining to the dawn |
| 500 | auspice | patronage or protection |
| 501 | austere | severe or strict in manner, attitude, or appearance |
| 502 | autarchy | a condition of absolute power |
| 503 | authentic | of the same origin as claimed, genuine |
| 504 | authoritarian | of, or relating to, absolute obedience to an authority |
| 505 | autobiography | a self-written biography, the story of one's own life |
| 506 | autocracy | a form of government in which one individual holds all power |
| 507 | autocrat | an absolute ruler with infinite power |
| 508 | automaton | a robot designed to follow a sequence of instructions |
| 509 | autopsy | a post-mortem examination to discover the cause of death |
| 510 | autumnal | of or relating to autumn |
| 511 | auxiliary | helping, giving assistance or support |
| 512 | avalanche | a large mass of snow sliding suddenly downward |
| 513 | avant-garde | innovative, pioneering, especially when obviously so |
| 514 | avarice | greediness over wealth, covetousness |
| 515 | avatar | an incarnation or manifestation of a person or idea |
| 516 | avenge | to vindicate by inflicting pain or evil on a wrongdoer |
| 517 | aver | to state or assert to be the case |
| 518 | averse | to turn away |
| 519 | avert | to turn aside or away |
| 520 | aviary | an enclosure for keeping birds confined |
| 521 | avid | having or showing keen interest |
| 522 | avidity | greediness, strong appetite |
| 523 | avocation | a calling away, a diversion |
| 524 | avow | assert or confess openly |
| 525 | avuncular | in the manner of an uncle, pertaining to an uncle |
| 526 | awaken | to cause to become awake |
| 527 | awe | to inspire fear and reverence |
| 528 | awry | crooked, distorted, out of place |
| 529 | axiom | a self-evident truth requiring no proof |
| 530 | aye | an affirmative vote, one who votes in the affirmative |
| 531 | azan | (Islam) the call to prayer proclaimed five times a day |
| 532 | azure | a light, purplish shade of blue |
| 533 | bacchanalian | riotously drunken |
| 534 | baconian | of or pertaining to the philosopher Francis Bacon |
| 535 | bacterium | a single celled organism with no nucleus |
| 536 | badger | to pester, to annoy persistently |
| 537 | badinage | playful raillery, banter |
| 538 | baffle | totally bewilder, confuse or perplex |
| 539 | bailiff | a legal officer, similar to a sheriff or deputy |
| 540 | baize | a woollen fabric resembling felt |
| 541 | bale | a large, wrapped bundle of something (ie, cotton, hay) |
| 542 | baleful | threatening harm, menacing |
| 543 | balk | to pass over or by |
| 544 | ballast | any heavy material used to stabilize a ship |
| 545 | balsam | a sweet-smelling oil or resin derived from various plants |
| 546 | banal | so lacking in originality as to be obvious and boring |
| 547 | bandy | to give and receive reciprocally, to exchange |
| 548 | bane | a cause of great distress or annoyance |
| 549 | banter | the playful and friendly exchange of teasing remarks |
| 550 | bar | except fro, apart from |
| 551 | barb | a sharp projection near the end of an arrow or similar item |
| 552 | barcarole | a venetian folk song traditionally sung by gondoliers |
| 553 | bard | a poet, often one who plays an instrument |
| 554 | baritone | the male voice between tenor and bass |
| 555 | barograph | a recording aneroid barometer |
| 556 | barometer | an instrument for measuring atmospheric pressure |
| 557 | barrage | to bombard someone with something |
| 558 | barren | empty, vacant |
| 559 | barrister | a lawyer who pleads in court |
| 560 | barterer | one who trades goods for other goods without involving money |
| 561 | bashful | shy, inclined to avoid notice |
| 562 | bask | to revel in, to lie exposed to warmth and light |
| 563 | bass | of sound which is low in pitch or frequency |
| 564 | baste | to sew with long, loose stitches |
| 565 | bastion | a projecting part of a rampart or other fortification |
| 566 | bathos | depth, bottom |
| 567 | baton | a short stick or staff used to conduct |
| 568 | battalion | a large body of troop ready for battle |
| 569 | batten | to become better, improve in condition |
| 570 | battery | a fortified emplacement for heavy guns |
| 571 | bauble | a cheap showy ornament piece of jewellery, a gewgaw |
| 572 | bawdy | soiled, dirty |
| 573 | bawl | to shout or utter in a loud and intense manner |
| 574 | beam | to emit beams of light, shine, radiate, |
| 575 | beatific | blessed, blissful, heavenly |
| 576 | beatify | to make blissful |
| 577 | beatitude | supreme, utmost bliss and happiness |
| 578 | beau | a frequent or attentive male companion |
| 579 | becalm | to make calm or still, make quiet, calm |
| 580 | beck | a stream or small river |
| 581 | bedaub | to smear upon, to soil |
| 582 | bedeck | to deck, ornament, or adorn, to grace |
| 583 | bedlam | a place or situation of chaotic uproar |
| 584 | bedraggle | to make something wet and limp |
| 585 | befog | to envelop in fog |
| 586 | befriend | to make a friend of |
| 587 | befuddle | to perplex or confuse (someone) |
| 588 | beget | to cause, to produce |
| 589 | begrudge | to be reluctant |
| 590 | beguile | to deceive or delude craftily |
| 591 | behemoth | a huge or monstrous creature |
| 592 | behest | to promise, vow |
| 593 | belabor | to work at something more than necessary |
| 594 | belay | to surround, environ, enclose |
| 595 | beleaguer | to lay siege to |
| 596 | belie | to lie around, encompass |
| 597 | belle | an attractive woman |
| 598 | bellicose | demonstrating aggression and willingness to fight |
| 599 | belligerent | hostile, aggressive |
| 600 | bellwether | the leading sheep of a flock, usually wearing a bell |