Synonyms of unthinking

1 Syllable

rash, gut, rude

2 Syllables

reflex, napping, tactless, thoughtless, stupid, heedless, discinct, brutish, guter, bruter, witless, selfish, unmeant, unthought, vacant, feckless, foolish, will-less, re-flex, mindless

3 Syllables

stupidest, off-the-wall, outrageous, imprudent, unthoughtful, blundering, ill-judged, incautious, senseless, haphazard, unwise, impetuous, unwilled, negligent, untactful, thick-headed, unalert, unguarded, unwatchful, indiscreet, unwitting, uncaring, unheeding, unmindful, unconscious, instinctual, nitwitted, oblivious, moronic, careless, airheaded, inconscient

4 Syllables

woolgathering, irrational, overhasty, precipitant, unobserving, unperceiving, unreasoning, cockamamie, unvigilant, unintended, uncritical, inadvertent, mechanical, undesigned, instinctive, intuitional, lamebrained, impulsive, reflexive, undiscerning, absent-minded, uncircumspect

5 Syllables

insensitive, undiplomatic, ill-considered, unadvisable, unconsidered, autogenetic, inattentive, indelicate, unintelligent, unintentional, uncalculated, irreflective, involuntary, machine-driven, second-nature, pococurante, unreflective

6 Syllables

unpremeditated, inconsiderate