| high-tech(adjective, caught, multiplex, daedal, gordian) |
| sophisticated(adjective, hard, fancy, difficult, complex) |
| Daedalean(adjective, hard, fancy, difficult, complex) |
| Gordian(adjective, hard, fancy, difficult, complex) |
| abstruse(adjective, hard, fancy, difficult, complex) |
| advanced |
| arduous(adjective, hard, fancy, difficult, complex) |
| byzantine(adjective, hard, fancy, difficult, complex) |
| can of worms(expression, adjective, idiom, hard, fancy) |
| complex(adjective, hard, fancy, difficult, intricate) |
| convoluted(adjective, hard, fancy, difficult, complex) |
| difficult(adjective, hard, fancy, complex, intricate) |
| elaborate(adjective, hard, fancy, difficult, complex) |
| entangled(adjective, hard, fancy, difficult, complex) |
| fancy(adjective, hard, difficult, complex, intricate) |
| futuristic(adjective, space-age) |
| gasser(adjective, hard, fancy, difficult, complex) |
| hard(adjective, fancy, difficult, complex, intricate) |
| interlaced(adjective, hard, fancy, difficult, complex) |
| intricate(adjective, hard, fancy, difficult, complex) |