knee-jerk

Synonyms

automatic, instinctive, instinctual, involuntary, mechanic, mechanical, robotic, spontaneous;

Antonyms

nonmechanical;

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;

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;