| mistaken(adjective, foolish, unreasonable, unwise, ill-advised) |
| nearsighted(adjective, dull, careless, indifferent, stupid) |
| neglectful(adjective, careless, indifferent, bold, thoughtless) |
| nerdy(weak, simple, silly, foolish, thoughtless) |
| not careful(expression, adjective, careless, bold, thoughtless) |
| nutty(weak, simple, silly, foolish, unreasonable) |
| oblivious(adjective, indifferent, casual, thoughtless, sloppy) |
| off guard(expression, adjective, careless, bold, thoughtless) |
| off the deep end(expression, careless, foolish, thoughtless, rash) |
| offhand(chance, casual, uninformed, random, happy-go-lucky) |
| overbold |
| overcareless |
| overconfident |
| overhasty(careless, foolish, thoughtless, impulsive, rash) |
| oversure |
| overweening |
| passionate(careless, thoughtless, impulsive, reckless, hasty) |
| pay no mind(expression, idiom, careless, bold, thoughtless) |
| pinheaded |
| playing with fire(expression, idiom, careless, foolish, bold) |