| esoteric(adjective, abstract, theoretical, abstruse, philosophical) |
| eternal(adjective, abstract, theoretical, abstruse, philosophical) |
| extramundane(adjective, obscure, dark, superior, supernatural) |
| extraordinary(adjective, superior, strange, marvelous, amazing) |
| extrasensory(adjective, obscure, dark, superior, supernatural) |
| fabulous(adjective, obscure, dark, superior, strange) |
| fairy(adjective, obscure, dark, superior, mysterious) |
| fundamental(adjective, abstract, theoretical, abstruse, philosophical) |
| ghostly(adjective, obscure, dark, superior, marvelous) |
| 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) |
| immaterial(adjective, abstract, theoretical, abstruse, philosophical) |
| impalpable(adjective, abstract, theoretical, abstruse, philosophical) |
| impenetrable(adjective, obscure, dark, superior, mysterious) |
| incorporeal(adjective, abstract, theoretical, abstruse, philosophical) |
| inexplicable(adjective, extraordinary, superior, strange, marvelous) |
| insubstantial(adjective, abstract, theoretical, abstruse, philosophical) |
| intangible(adjective, abstract, theoretical, abstruse, philosophical) |