| nasty(adjective, hard, difficult, complex, dangerous) |
| complex(adjective, hard, difficult) |
| delicate(adjective, understanding, keen, fine, difficult) |
| severe(adjective, hard, difficult, complex, dangerous) |
| ticklish(adjective, upset, understanding, keen, fine) |
| complicated(adjective, hard, difficult, complex) |
| dire(adjective, hard, difficult, complex) |
| hard(adjective, difficult, complex) |
| intricate(adjective, hard, difficult, complex) |
| involved(adjective, hard, difficult, complex) |
| knotty(adjective, hard, difficult, complex) |
| weighty(adjective, hard, difficult, complex) |
| dubious(adjective, doubtful, unreliable, tricky, insecure) |
| unsafe(adjective, doubtful, unreliable, tricky, insecure) |
| chancy(adjective, adverb, open, delicate, uncertain) |
| doubtful(adjective, uncertain, unstable, shaky, vague) |
| touch-and-go(adjective, delicate, uncertain, awkward, sensitive) |
| unsure(adjective, change, strong, uncertain, doubtful) |
| critical(adjective, bad, difficult, delicate, heavy) |
| touchy(adjective, understanding, keen, fine, difficult) |