Synonyms of irreflective

2 Syllables
thoughtless, heedless, unthought, reckless, chance, feckless
3 Syllables
unplanned, unwitting, uncaring, unheeding, unmindful, unthinking, careless, negligent
4 Syllables
unintended, lamebrained, inadvertent, undesigned, undevised, unconcerned
5 Syllables
unintentional, unreflective
6 Syllables
unpremeditated