| impassive |
| impervious(adjective, indifferent, detached, distant, apathetic) |
| impetuous(careless, bold, thoughtless, rash, wary) |
| imprecise(soft, tolerant, slack, lenient, remiss) |
| improvident(adjective, careless, casual, bold, thoughtless) |
| imprudent(careless, wild, stupid, casual, bold) |
| impulsive(adjective, careless, bold, thoughtless, inappropriate) |
| in any way(expression, idiom) |
| in despite of(expression, idiom) |
| in spite of everything(expression, idiom, adverb, counter, yet) |
| inaccurate(soft, casual, tolerant, slack, lenient) |
| indefinite(soft, tolerant, slack, lenient, remiss) |
| indolent(slow, careless, indifferent, casual, thoughtless) |
| inexcitable |
| irrespectively |
| irresponsible(careless, wild, casual, thoughtless, negligent) |
| lenient(soft, tolerant, slack, remiss) |
| lost(adjective, careless, indifferent, apathetic, distracted) |
| madcap(careless, wild, bold, thoughtless, wary) |
| musing(adjective, careless, indifferent, apathetic, distracted) |