| complicated(adjective, upset, hard, simple, difficult) |
| intricate(adjective, hard, simple, difficult, delicate) |
| difficult(adjective, hard, difficult, delicate, awkward) |
| hard(adjective, difficult, tedious, involved, demanding) |
| knotty(adjective, hard, simple, difficult, delicate) |
| involved(adjective, hard, simple, bright, difficult) |
| compound(noun, adjective, hard, simple, difficult) |
| elaborate(adjective, hard, simple, difficult, involved) |
| labyrinthine(adjective, hard, simple, difficult, involved) |
| composite(noun, adjective, hard, mixed, simple) |
| byzantine(adjective, hard, simple, difficult, involved) |
| tricky(adjective, hard, difficult, delicate, awkward) |
| thorny(adjective, hard, difficult, delicate, awkward) |
| sophisticated(adjective, hard, difficult, involved, dense) |
| Gordian(adjective, hard, difficult, involved, dense) |
| daedal(adjective, hard, simple, difficult, involved) |
| laborious(adjective, hard, difficult, tedious, demanding) |
| tangled(adjective, hard, simple, difficult, loose) |
| arduous(adjective, hard, difficult, tedious, demanding) |
| knotted(adjective, hard, difficult, complicated, complexity) |