| complex(adjective, hard, simple, difficult, delicate) |
| complicated(adjective, hard, complete, simple, fancy) |
| involved(adjective, hard, simple, difficult, delicate) |
| knotty(adjective, hard, simple, evil, difficulty) |
| elaborate(adjective, hard, complete, simple, fancy) |
| difficult(adjective, hard, delicate, complex, awkward) |
| labyrinthine(adjective, hard, simple, difficulty, difficult) |
| tricky(adjective, hard, difficult, delicate, complex) |
| byzantine(adjective, hard, simple, difficult, complex) |
| sophisticated(adjective, hard, difficult, complex, involved) |
| daedal(adjective, hard, simple, difficult, complex) |
| hard(adjective, difficult, complex, awkward, involved) |
| thorny(adjective, hard, difficulty, difficult, delicate) |
| knotted(adjective, hard, difficulty, difficult, complex) |
| tough(adjective, hard, difficult, complex, laborious) |
| problematic(adjective, hard, difficult, delicate, complex) |
| Gordian(adjective, hard, difficult, complex, involved) |
| perplexed(adjective, hard, difficult, complex, complexity) |
| compound(noun, adjective, hard, difficult, complex) |
| profound(adjective, hard, difficult, complex) |