| impotent(adjective, rebellious) |
| imprudent(adjective, mean, violent, wild, determined) |
| incurable(tough, difficult, wild, awkward, obstinate) |
| inexorable(adjective, persistent, obstinate, insistent, dogged) |
| inextinguishable |
| insoluble(tough, difficult, wild, awkward, obstinate) |
| intolerable |
| inveterate(adjective, persistent, obstinate, insistent, dogged) |
| invincible(adjective, persistent, obstinate, insistent, dogged) |
| iron(adjective, persistent, obstinate, insistent, dogged) |
| irrational(adjective, foolish, crazy, outrageous, unconventional) |
| locked-in(determined, impulsive, stubborn, reckless, impetuous) |
| locked in(tough, difficult, wild, determined, awkward) |
| mad(adjective, violent, wild, cruel, foolish) |
| malcontent |
| mule(determined, impulsive, stubborn, reckless, impetuous) |
| murder(determined, impulsive, stubborn, reckless, impetuous) |
| narrow-minded(adjective, persistent, obstinate, insistent, dogged) |
| noisy(adjective, foolish, crazy, unstable, unsettled) |
| obsessive(adjective, persistent, obstinate, insistent, dogged) |