| impromptu |
| improvident(adjective, careless, bold, thoughtless, impulsive) |
| improvised |
| imprudent(adjective, careless, bold, thoughtless, wary) |
| impulsive(adjective, careless, bold, thoughtless, inappropriate) |
| in a daze(expression, adjective, idiom, unconcerned, ignorant) |
| in the dark(expression, adjective, idiom, ignorant, unaware) |
| inattentive(adjective, blank, unconcerned, ignorant, naive) |
| incautious(adjective, careless, careful, rash, reckless) |
| inconsiderate(adjective, careless, bold, thoughtless, impulsive) |
| inconversant(adjective, unconcerned, ignorant, unconscious, heedless) |
| indiscreet(adjective, careless, bold, thoughtless, impulsive) |
| injudicious(adjective, careless, bold, thoughtless, impulsive) |
| madcap(adjective, careless, bold, thoughtless, wary) |
| makeshift |
| mindless |
| mooning(adjective, unconcerned, ignorant, unconscious, heedless) |
| napping |
| neglectful(adjective, careless, bold, thoughtless, impulsive) |
| nescient(adjective, unconcerned, ignorant, unconscious, heedless) |