| implacable(adjective, appearance, mean, strong, hard) |
| intemperate(adjective, hard, tough, rough, difficult) |
| intractable(adjective, tough, persistent, reserved, obstinate) |
| not good |
| obstinate(adjective, rigid) |
| prudish(adjective, shy, strict, fastidious) |
| sarcastic(adjective, mean, sharp, nasty, cross) |
| stabbing(adjective, painful) |
| throbbing(adjective, painful, sickness, ache, anguishes) |
| unmerciful(adjective, mean, harsh, cruel, vicious) |
| virulent(adjective, nasty, wicked, intelligent, hostile) |
| careful(adjective, close, correct, solid, exact) |
| earnest(adjective, calm, quiet, set, strong) |
| gruff(adjective, hard, sharp, nasty, rude) |
| Spartan |
| acerbic(adjective, mean, sharp, nasty, harsh) |
| acid(adjective, mean, sharp, nasty, bitter) |
| aloof(adjective, calm, tough, firm, restrained) |
| ascetic |
| barbarous(adjective, appearance, mean, harsh, awful) |