| grit(noun, state, characteristic, propery) |
| hard(adjective, difficulty, toughness, characteristics) |
| illegitimate(adjective, description, characteristics, traits) |
| illogical(adjective, description, characteristics, traits) |
| inconsequent(adjective, description, characteristics, traits) |
| inconsequential(adjective, description, characteristics, traits) |
| invalid(adjective, description, characteristics, traits) |
| irksome(adjective, difficulty, toughness, characteristics) |
| irrational(adjective, description, characteristics, traits) |
| irritating(adjective, difficulty, toughness, characteristics) |
| nonrational(adjective, description, characteristics, traits) |
| onerous(adjective, difficulty, toughness, characteristics) |
| oppressive(adjective, difficulty, toughness, characteristics) |
| perseverance(noun, state, characteristic, propery) |
| pestilent(adjective, difficulty, toughness, characteristics) |
| provocative(adjective, difficulty, toughness, characteristics) |
| relaxed(adjective, characteristic, character, trait) |
| resilience(noun, state, characteristic, propery) |
| rough(adjective, difficulty, toughness, characteristics) |
| self-possessed(adjective, characteristic, character, trait) |