| sinuous(adjective, hard, difficult, complex, straight) |
| labyrinthine(adjective, hard, difficult, complex) |
| intricate(adjective, hard, difficult, complex) |
| complex(adjective, hard, difficult) |
| knotty(adjective, hard, difficult, complex) |
| Byzantine(adjective, hard, difficult, complex) |
| complicated(adjective, hard, difficult, complex) |
| involute(adjective, hard, difficult, complex) |
| involved(adjective, hard, difficult, complex) |
| tortuous(adjective, straight, repetition, twisted, convolution) |
| daedal(adjective, hard, difficult, complex) |
| elaborate(adjective, hard, difficult, complex) |
| serpentine(adjective, straight, repetition, sly, convolution) |
| winding(adjective, straight, repetition, convolution) |
| roundabout(adjective, straight, winding) |
| circuitous(adjective, straight, bent, crooked, supple) |
| devious(adjective, straight) |
| flexuous(adjective, straight, repetition, convolution) |
| crooked(adjective, winding) |
| indirect(adjective, straight, winding) |