| gutty(adjective, smart, bold, brave, impulsive) |
| half-baked(silly, foolish, fantastic, thoughtless, unwise) |
| hard-core(determined, impulsive, stubborn, reckless, impetuous) |
| hard-nosed(determined, impulsive, stubborn, reckless, impetuous) |
| hard-shell(determined, impulsive, stubborn, reckless, heedless) |
| hardy(strong, bold, spirited, brave, courageous) |
| heroic(strong, bold, spirited, brave, courageous) |
| herolike(strong, bold, spirited, brave, courageous) |
| hot-headed |
| hot shot(expression, adjective, smart, bold, brave) |
| ill-conceived(silly, foolish, fantastic, unwise, half-baked) |
| ill-judged(adjective, careless, foolish, thoughtless, rash) |
| illogical(adjective, foolish, stupid, fantastic, absurd) |
| imbecilic(adjective, foolish, crazy, insane, impractical) |
| immature(careless, foolish, stupid, thoughtless, impulsive) |
| impolitic(adjective, rude, careless, foolish, thoughtless) |
| impudent(adjective, smart, rude, careless, bold) |
| inappropriate(rude, silly, foolish, stupid, fantastic) |
| indomitable(strong, bold, spirited, brave, courageous) |
| inexpedient(adjective, careless, foolish, thoughtless, rash) |