| able |
| abnormal(adjective, obscure, dark, superior, mysterious) |
| abstruse(adjective, strange, deep, unknown, curious) |
| alchemistic(adjective, strange, unknown, curious, concealed) |
| anagogic(adjective, supernatural, imaginary, spiritual, mystical) |
| astrological(adjective, strange, unknown, curious, concealed) |
| baffling(adjective, solid, strange, deep, dense) |
| beats me(expression, adjective, unfathomable, impenetrable, opaque) |
| belief(adjective, extraordinary, strange, unbelievable, implausible) |
| beyond comprehension(expression, adjective, unfathomable, impenetrable, opaque) |
| beyond reason(expression, adjective, extraordinary, strange, unbelievable) |
| beyond understanding |
| celestial(adjective, obscure, dark, superior, mysterious) |
| clear as mud(expression, adjective, deep, unfathomable, profound) |
| concealed(adjective, obscure, dark, superior, strange) |
| covert(adjective, strange, unknown, curious, concealed) |
| cryptic(adjective, strange, spiritual, unfathomable, impenetrable) |
| curious(adjective, strange, unknown, concealed, inexplicable) |
| deep(adjective, heavy, profound, bottomless) |
| difficult(adjective, obscure, dark, strange, odd) |