| unaccountable(adjective, madcap, feckless, irresponsive) |
| unadvised(adjective, smart, careless) |
| uncareful(adjective, weak, careless, wild, thought) |
| undiplomatic(adjective, rude, impulsive, unkind, aggressive) |
| undiscriminating |
| unjustifiable |
| unplanned(noun, adjective, impulsive, rash, unthinking) |
| unthoughtful(adjective, thoughtless) |
| vehement(adjective, crazy, mad, odd, insane) |
| weak(adjective, feature, state, careless, trait) |
| willful(violent, careless, determined, fast, quick) |
| abrupt(adjective, violent, fast, quick, thoughtless) |
| absent-minded(casual, obtuse, happy-go-lucky, slapdash, unperceptive) |
| agile(quick, speedy, hurried) |
| apathetic(unkind, uncaring, inconsiderate) |
| asinine(careless, silly, stupid, thoughtless, unwise) |
| brazen(adjective, rash) |
| brisk(adjective, cheerful, jolly, quick, cheery) |
| brittle(adjective, excitable) |
| chaotic(adjective, violent, silly, foolish, crazy) |