| compound(adjective, hard, difficult, complex) |
| impossible(adjective, hard, difficulty, difficult, complex) |
| inextricable(adjective, hard, difficult, complex) |
| tangly(adjective, hard, difficult, complex) |
| thorny(adjective, hard, difficulty, difficult, complex) |
| convoluted(adjective, hard, simple, fancy, obscure) |
| esoteric(adjective, hard, difficult, complex) |
| profound(adjective, hard, difficult, complex) |
| rugged(adjective, hard, difficulty, difficult, complex) |
| stubborn(adjective, hard, difficulty, difficult, complex) |
| trying(adjective, hard, difficulty, difficult, complex) |
| tortuous(adjective, obscure, difficult, complex, sophisticated) |
| tangled(adjective, hard, simple, obscure, difficulty) |
| mazy(adjective, obscure, difficult, awkward, sophisticated) |
| labyrinthian(adjective, secret, convolution) |
| winding(adjective, convoluted) |
| twisting(adjective, convoluted) |
| meandering(adjective, obscure, complex, sophisticated, complicated) |
| perplexing(adjective, hard, fancy, obscure, difficult) |
| serpentine(adjective, convoluted) |