| complex(adjective, hard, difficult, complex, involved) |
| refined(adjective, smooth, reasonable, slight, fancy) |
| complicated(adjective, hard, difficult, complex, involved) |
| elaborate(adjective, hard, difficult, complex, involved) |
| cultured(adjective, smooth, delicate, superior, proper) |
| intricate(adjective, hard, difficult, complex, involved) |
| involved(adjective, hard, difficult, complex, dense) |
| knotty(adjective, hard, difficult, complex, involved) |
| elegant(adjective, style, fancy, exact, superior) |
| tricky(adjective, hard, difficult, deception, complex) |
| urbane(adjective, smooth, superior, proper, refined) |
| labyrinthine(adjective, hard, difficult, complex, involved) |
| daedal(adjective, hard, difficult, complex, involved) |
| sensitive(adjective, hard, difficult, superior, complex) |
| cultivated(verb, adjective, smooth, reasonable, superior) |
| byzantine(adjective, hard, difficult, complex, involved) |
| profound(adjective, hard, difficult, complex, intelligent) |
| gordian(adjective, hard, difficult, complex, involved) |
| well-versed(familiar, knowledgeable, skilled, competent, qualified) |
| difficult(adjective, hard, complex, involved, dense) |