| brainless(adjective, dull, silly, foolish, stupid) |
| forgetful(adjective, careless, indifferent, silly, foolish) |
| habitual(adjective, cold, natural, useful, fixed) |
| ill-considered(adjective, careless, foolish, stupid, thoughtless) |
| illogical(adjective, foolish, unreasonable, thoughtless) |
| insensitive(adjective, careless, thoughtless, unkind, selfish) |
| knee-jerk(adjective, natural, emotional, impulsive, unconscious) |
| rude(adjective, careless, thoughtless, unkind, insensitive) |
| unconsidered(adjective, careless, foolish, casual, rash) |
| unguarded(adjective, careless, casual, thoughtless, impulsive) |
| unmeditated(adjective, natural, unconscious, instinctive, automatic) |
| unoccupied(adjective, thoughtless, incogitancy) |
| unprompted(adjective, natural, instinctive, unwilling, automatic) |
| unreasonable(adjective, careless, foolish, stupid, thoughtless) |
| unwary(adjective, careless, foolish, thoughtless, impulsive) |
| unwise(adjective, careless, foolish, unreasonable, thoughtless) |
| improvident(adjective, careless, foolish, casual, bold) |
| inherent(adjective, natural, instinctive, automatic, innate) |
| injudicious(adjective, wrong, sharp, rough, careless) |
| instinctual(adjective, natural, unconscious, instinctive, unwilling) |