| hard(adjective, difficult, complex, grand, involved) |
| inextricable(adjective, hard, difficult, complex) |
| composite(adjective, hard, difficult, complex) |
| perplexed(adjective, hard, difficult, complex) |
| ponderous(adjective, hard, difficult, complex) |
| problematic(adjective, hard, difficult, complex, intricate) |
| rough(adjective, hard, difficult, complex) |
| tangly(adjective, hard, difficult, complex) |
| toilsome(adjective, hard, difficult, complex, exertion) |
| ambitious(adjective, hard, ability, difficult, complex) |
| anfractuous(adjective, hard, difficult, complex) |
| sheer(adjective, hard, fancy, difficult, delicate) |
| sinuous(adjective, hard, difficult, complex) |
| thorny(adjective, hard, difficult, complex, intricate) |
| tricky(adjective, hard, difficult, complex, involved) |
| detailed(adjective, close, complete, complex, full) |
| Rococo(adjective, fancy, delicate, complex, special) |
| develop(verb, form, take, close, get) |
| enlarge(verb, change, increase, open, develop) |
| expand(verb, change, increase, develop, progress) |