| huffish |
| hyper(adjective, passionate, unstable, unpredictable, unreliable) |
| hypersensitive(adjective, passionate, unstable, unpredictable, unreliable) |
| ill-disposed(adjective, mean, nasty, vicious, wicked) |
| ill-humored(unpleasant, irritable, disagreeable, ugly, crabby) |
| ill-tempered(rude, unpleasant, coarse, disagreeable, sullen) |
| impatient(adjective, passionate, unstable, unpredictable, unreliable) |
| in bad mood(expression, adjective, idiom, passionate, unstable) |
| inconsistent(adjective, passionate, unstable, unpredictable, unreliable) |
| indomitable(adjective, persistent, obstinate, insistent, dogged) |
| infamous(adjective, nasty, violent, terrible, wild) |
| inflexible(tough, firm, unreasonable, obstinate, stubborn) |
| iniquitous |
| insurgent(adjective, persistent, obstinate, insistent, dogged) |
| inveterate(adjective, persistent, obstinate, insistent, dogged) |
| invincible(adjective, persistent, obstinate, insistent, dogged) |
| iron(adjective, persistent, obstinate, insistent, dogged) |
| like a bear(expression, idiom, irritable, ugly, crabby) |
| loathsome(adjective, nasty, terrible, disgusting, vicious) |
| malefic |