| immature(adjective, careless, thoughtless, impulsive, reckless) |
| immitigable |
| impetuous(adjective, careless, thoughtless, impulsive, reckless) |
| imprudent(adjective, careless, thoughtless, impulsive, reckless) |
| incautious(adjective, careless, thoughtless, impulsive, reckless) |
| incontrollable |
| indiscreet(adjective, careless, thoughtless, impulsive, reckless) |
| indocile |
| injudicious(adjective, careless, thoughtless, impulsive, reckless) |
| intractable |
| irrational(adjective, careless, thoughtless, impulsive, reckless) |
| jumping to conclusions(expression, adjective, idiom, careless, thoughtless) |
| like a loose cannon(expression, adjective, idiom, violent, wild) |
| madcap(adjective, careless, thoughtless, impulsive, reckless) |
| obstreperous |
| out of hand(expression, idiom) |
| overhasty(adjective, careless, thoughtless, impulsive, reckless) |
| passionate(adjective, careless, thoughtless, impulsive, reckless) |
| precipitant(adjective, careless, thoughtless, impulsive, rash) |
| precipitate(adjective, careless, thoughtless, impulsive, reckless) |