| hard-line(adjective, strong, hard, tough, severe) |
| hard-nosed(adjective, strong, hard, tough, severe) |
| hard-shell(adjective, strong, hard, tough, severe) |
| hardheaded(adjective, strong, hard, tough, severe) |
| having blue devils(expression, idiom, low, gloomy, depressed) |
| having the blahs(expression, idiom, low, gloomy, depressed) |
| huffy(unstable, changeable, temperamental) |
| ill-humored(low, gloomy, miserable, depressed, sullen) |
| ill-tempered(low, gloomy, miserable, unstable, depressed) |
| implacable(adjective, strong, hard, tough, severe) |
| impulsive(melancholy, miserable, unstable, changeable, temperamental) |
| in a bad mood(expression, idiom, low, gloomy, depressed) |
| in a blue funk(expression, idiom, low, gloomy, depressed) |
| in a huff(expression, idiom, melancholy, miserable, unstable) |
| in the doldrums(expression, idiom, melancholy, miserable, unstable) |
| inclement |
| inexorable(adjective, strong, hard, tough, severe) |
| inflexible(adjective, strong, hard, tough, severe) |
| intimidatory |
| irritable(low, miserable, unstable, ugly, sullen) |