| bullyboy(noun, bad, temper, brave, bull) |
| cool(adjective, calm, mean, bad, strong) |
| intractable(adjective, hard, rough, firm, difficult) |
| mighty(adjective, person, body, strong, great) |
| steady(adjective, calm, strong, sound, heavy) |
| stringent(adjective, hard, severe, firm, difficult) |
| athletic(adjective, person, body, strong, sound) |
| austere(adjective, strong, hard, severe, sharp) |
| bad(adjective, good, complete, top, excellent) |
| desperado(noun, blusterer, evildoer, evil doer) |
| exhausting(adjective, dull, hard, difficult, boring) |
| hard-hearted(adjective, mean, hard, severe, harsh) |
| hard-line(adjective, characteristic, strong, hard, rough) |
| healthy(adjective, strong, fit, condition, intense) |
| indifferent(adjective, calm, mean, hard, cool) |
| irksome(adjective, dull, difficulty, difficult, boring) |
| mean(noun, adjective, clear, hard, cool) |
| persistent(adjective, firm, unreasonable, grim, resolute) |
| pitiless(adjective, hard, severe, sharp, harsh) |
| resistant(adjective, strong, hard, fit, firm) |