| knobbed |
| labyrinthine(adjective, hard, difficult, delicate, loose) |
| mootable(adjective, certain, debatable) |
| mysterious(hard, delicate, uncertain, complex, doubtful) |
| mystifying(hard, delicate, complex, awkward, tricky) |
| obscure(adjective, hard, uncertain, doubtful, dubious) |
| rugged(adjective, difficult, complex, awkward, demanding) |
| suspect(uncertain, doubtful, dubious, tricky, sticky) |
| thorny(adjective, hard, difficult, delicate, complex) |
| ticklish(hard, delicate, complex, tricky, complicated) |
| troublesome(adjective, hard, difficult, delicate, loose) |
| unclear(adjective, clear, hard, obscure, delicate) |
| vague(adjective, uncertain, doubtful, dubious, ambiguous) |
| Gordian(adjective, difficult, complex, awkward, tricky) |
| abstract(hard, delicate, complex, tricky, complicated) |
| abstruse(adjective, hard, difficult, delicate, loose) |
| absurd |
| amorphous |
| betwixt and between(adjective, debatable) |
| beyond belief |