| precarious(tricky, risky, hazardous, sticky, challenging) |
| puzzling(adjective, hard, difficult, loose, complex) |
| suspicious |
| tough |
| unresolved(adjective, uncertain, settled) |
| unsure(adjective, clear, certain, ambiguous) |
| bewildering(hard, tricky, complicated) |
| challenging(adjective, difficult, awkward, demanding, tricky) |
| clouded(adjective, clear, certain, ambiguous) |
| complex(adjective, hard, difficult, delicate, loose) |
| confounding(hard, delicate, complex, tricky, complicated) |
| confusing(hard, delicate, complex, tricky, complicated) |
| contestable(adjective, debatable) |
| contested(adjective, certain, debatable) |
| convoluted(adjective, difficult, complex, intricate, thorny) |
| critical |
| fishy |
| grueling(adjective, difficult, awkward, demanding) |
| hard(adjective, difficult, complex, awkward, demanding) |
| inconclusive(adjective, clear, certain, ambiguous) |