| complicated(adjective, hard, simple, difficult, complex) |
| complex(adjective, hard, simple, difficult, involved) |
| intricate(adjective, hard, simple, difficult, complex) |
| elaborate(adjective, hard, simple, difficult, complex) |
| involved(adjective, hard, simple, difficult, complex) |
| knotty(adjective, hard, simple, difficult, complex) |
| labyrinthine(adjective, hard, simple, difficult, complex) |
| daedal(adjective, hard, simple, difficult, complex) |
| Gordian(adjective, hard, difficult, complex, involved) |
| difficult(adjective, hard, complex, involved, dense) |
| sophisticated(adjective, hard, difficult, complex, involved) |
| involute(adjective, hard, simple, difficult, complex) |
| knotted(adjective, hard, difficult, complex) |
| problematic(adjective, hard, difficult, complex, intricate) |
| sinuous(adjective, hard, difficult, complex) |
| anfractuous(adjective, hard, difficult, complex) |
| arduous(adjective, hard, difficult, complex, intricate) |
| compound(adjective, hard, difficult, complex) |
| hard(adjective, difficult, complex, involved, complicated) |
| laborious(adjective, hard, difficult, complex) |