| harebrained(careless, wild, immoral, thoughtless, negligent) |
| harum-scarum(adjective, feature, state, trait) |
| high-spirited(adjective, feature, state, trait) |
| hit-or-miss(adjective, insignificant, irregular, empty, senseless) |
| hollow(adjective, value, insignificant, unimportant, empty) |
| hot air(expression, adjective, value, insignificant, unimportant) |
| idle(weak, stupid, inferior, inadequate, feeble) |
| impracticable(weak, stupid, idle, useless, incompetent) |
| impractical(weak, stupid, idle, useless, incompetent) |
| improvident |
| imprudent(careless, wild, thoughtless, rash, reckless) |
| incapable |
| inconsequential(adjective, value, insignificant, unimportant, empty) |
| inconsiderate(careless, wild, thoughtless, rash, oblivious) |
| indecisive(inferior, inadequate, limited, feeble, useless) |
| indiscriminate(adjective, insignificant, irregular, empty, senseless) |
| inferior(inadequate, limited, feeble, useless, vain) |
| innocuous(inferior, inadequate, limited, feeble, useless) |
| insensible(adjective, indifferent, unsympathetic, inattentive, uninterested) |
| insensitive(adjective, careless, indifferent, thoughtless, unsympathetic) |