| hard(adjective, feature, state, characteristic) |
| difficult(adjective, feature, state, characteristic) |
| arduous(adjective, feature, state, characteristic) |
| tough(adjective, feature, state, characteristic) |
| grievous(adjective, feature, state, characteristic) |
| laborious(adjective, feature, state, characteristic) |
| oppressive(adjective, feature, state, characteristic) |
| painful(adjective, feature, state, characteristic) |
| severe(adjective, feature, state, characteristic) |
| toilsome(adjective, feature, state, characteristic) |
| trying(adjective, feature, state, characteristic) |
| burdensome(adjective, feature, state, characteristic) |
| complicated(adjective, feature, state, characteristic) |
| intricate(adjective, feature, state, characteristic) |
| knotty(adjective, feature, state, characteristic) |
| onerous(adjective, feature, state, characteristic) |
| ponderous(adjective, feature, state, characteristic) |
| punishing(adjective, feature, state, characteristic) |
| rough(adjective, feature, state, characteristic) |
| taxing(adjective, feature, state, characteristic) |