| abstruse(adjective, abstract, theoretical, philosophical) |
| arcane |
| bodiless(adjective, abstract, theoretical, abstruse, philosophical) |
| celestial(adjective, obscure, dark, superior, mysterious) |
| concealed(adjective, obscure, dark, superior, mysterious) |
| deep(adjective, abstract, theoretical, abstruse, philosophical) |
| difficult(adjective, abstract, theoretical, abstruse, philosophical) |
| discarnate(adjective, abstract, theoretical, abstruse, philosophical) |
| eternal(adjective, abstract, theoretical, abstruse, philosophical) |
| extrasensory(adjective, obscure, dark, superior, supernatural) |
| extraterrestrial |
| fabulous(adjective, obscure, dark, superior, strange) |
| fairy(adjective, obscure, dark, superior, mysterious) |
| fey |
| fundamental(adjective, abstract, theoretical, abstruse, philosophical) |
| ghostly(adjective, obscure, dark, superior, mysterious) |
| heavenly(adjective, obscure, dark, superior, mysterious) |
| hidden(adjective, obscure, dark, superior, mysterious) |
| high-flown(adjective, abstract, theoretical, abstruse, philosophical) |
| ideal(adjective, abstract, theoretical, abstruse, philosophical) |