| stale(adjective, hard, warm, difficult, complex) |
| thorny(adjective, hard, difficult, complex) |
| tricky(adjective, hard, difficult, complex) |
| despotic(adjective, cruel, overwhelming, dominant, domineering) |
| drudgery(noun, adjective, hard, difficult, complex) |
| grave(adjective, hard, difficult, complex) |
| lumpish(adjective, hard, difficult, complex) |
| operose(adjective, hard, difficult, complex) |
| troubled(adjective, hard, difficult, sad, unhappy) |
| ambitious(adjective, hard, difficult, complex) |
| dire(adjective, hard, difficult, complex) |
| hard-nosed(adjective, hard, difficult, complex, severity) |
| impossible(adjective, hard, difficult, complex) |
| intricate(adjective, hard, difficult, complex, demanding) |
| sheer(adjective, hard, difficult, complex) |
| dictatorial(adjective, hard, tough, difficult, overwhelming) |
| stuffy(adjective, moist, close, tough, severe) |
| brutal(adjective, overwhelming, tyrannical, repressive) |
| stifling(adjective, moist, close, warm, hot) |
| close(adjective, moist, severe, warm, harsh) |