| unexplainable(adjective, strange, unfathomable, inexplicable) |
| bizarre(adjective, extraordinary, unusual, strange, exceptional) |
| bothering |
| deep(adjective, hard, evil, obscure, delicate) |
| disturbing(adjective, obscure, awkward, sophisticated, uneasy) |
| hazy(uncertain, vague, unclear, ambiguous, misleading) |
| heavy |
| implausible(adjective, likely, unlikely, unbelievable, improbable) |
| inconceivable(adjective, unreasonable, dubious, unlikely, flimsy) |
| indeterminate(obscure, uncertain, vague, unclear, ambiguous) |
| mystic(adjective, knowledge, evil, obscure, strange) |
| oracular(adjective, dark, strange, uncertain, mysterious) |
| problematical(adjective, hard, difficult, loose, complex) |
| questionable(unusual, strange, uncertain, vague, unclear) |
| rare(extraordinary, unusual, strange, remarkable, particular) |
| remarkable(extraordinary, unusual, strange, exceptional, odd) |
| thorny(adjective, hard, difficult, loose, complex) |
| twisted(adjective, confused) |
| unimaginable(adjective, extraordinary, exceptional, remarkable, particular) |
| upsetting(adjective, awkward, uneasy, uncomfortable) |