| hardened(determined, fixed, stubborn, willful, dogmatic) |
| hardheaded(tough, firm, unreasonable, grim, inflexible) |
| haughty(adjective, obstinate, headstrong) |
| hell-bent(adjective, persistent, obstinate, insistent, dogged) |
| hidebound(adjective, persistent, obstinate, insistent, dogged) |
| high on(expression, adjective, passionate, violent, enthusiastic) |
| immoderate(adjective, passionate, violent, enthusiastic, fervent) |
| impassioned(adjective, passionate, violent, enthusiastic, fervent) |
| impatient |
| impudent |
| impulsive(adjective, passionate, violent, enthusiastic, fervent) |
| independent |
| indocile |
| infatuated(adjective, passionate, violent, enthusiastic, fervent) |
| inimical(negative, hostile, different, adverse, conflicting) |
| insolent |
| insuppressible |
| inveterate(adjective, persistent, obstinate, insistent, dogged) |
| invincible(adjective, persistent, obstinate, insistent, dogged) |
| iron(adjective, persistent, obstinate, insistent, dogged) |