automatic

1 done instantly and without conscious thought or decision Carl's automatic use of the brakes narrowly averted a collision Synonyms instinctive, instinctual, involuntary, knee-jerk, mechanic, mechanical, robotic, spontaneous Related Words conditioned, natural, Pavlovian, reactive, reflex, simple, subliminal, unconscious, unforced, visceral; blind, inadvertent, unintended, unintentional, unwilling, unwitting; abrupt, quick, ready, sudden; ad-lib, extemporaneous, extempore, impromptu, improvised, offhand, offhanded, off-the-cuff, snap, spur-of-the-moment, unconsidered, unplanned, unpremeditated, unprepared, unprompted, unreasoned, unrehearsed, unstudied; casual, chance, chancy, haphazard, hasty, hit-or-miss, impetuous, impulsive, mindless, random, rash Near Antonyms calculated, conscious, cultivated, deliberate, designed, intended, intentional, predetermined, prepared, projected, refined, rehearsed, volitional, voluntary, willed, willful (or wilful); advised, aforethought, careful, considered, foresighted, forethoughtful, measured, meticulous, reasoned, studied, thoughtful Antonyms nonmechanical

2 designed to replace or decrease human labor and especially physical labor liked the ease of an automatic CD changer Synonyms automated, laborsaving, robotic, self-acting, self-operating, self-regulatingRelated Words mechanical, motorized, nonmanual; computerized; aiding, helping; easing, relieving; time-saving; semiautomaticAntonyms nonautomated, nonautomatic