| hard(adjective, person, dull, mean, body) |
| difficult(adjective, dull, hard, great, easy) |
| severe(adjective, clear, bad, strong, hard) |
| rugged(adjective, action, strong, hard, sound) |
| rough(noun, adjective, action, person, mean) |
| strong(adjective, calm, person, body, strong) |
| arduous(adjective, dull, hard, great, easy) |
| laborious(adjective, dull, hard, great, easy) |
| burdensome(adjective, dull, hard, difficult, harsh) |
| harsh(adjective, mean, strong, hard, cool) |
| stubborn(adjective, characteristic, quality, mean, strong) |
| stressful(adjective, hard, difficult, complex) |
| ruffian(noun, person, mean, bad, attack) |
| knotty(adjective, hard, difficult, complex, troublesome) |
| sticky(adjective, feature, characteristic, hard, difficult) |
| taxing(adjective, hard, severe, rough, difficult) |
| toilsome(adjective, hard, difficulty, difficult, complex) |
| hard-nosed(adjective, mean, clear, strong, hard) |
| unyielding(adjective, characteristic, mean, clear, strong) |
| trying(adjective, dull, hard, rough, difficult) |