Synonyms of neglectful

1 Syllable

lax, slack

2 Syllables

lazy, laxer, lazier, thoughtless, laziest, heedless, remiss, purblind, mindless, discinct

3 Syllables

amnesic, forgetful, regardless, slow-moving, nonchalant, nitwitted, oblivious, unthoughtful, hot-headed, delinquent, asocial, derelict, incautious, uncaring, unmindful, defaultant, nirvanic, unready, behindhand, unalert, negligent, unwatchful

4 Syllables

lamebrained, nonspecific, dilatory, unexcited, nonobservant, moratory, unindustrious, indifferent, amnemonic, undiscerning, unperceiving, unobserving, unvigilant, disregardful

5 Syllables

unimpressible, unenergetic, disimpassioned, unperceptive, unrecognizing, uncomprehending, inattentive, unreflective