| nebulous |
| nonmaterial(abstract, theoretical, abstruse, philosophical) |
| nonphysical(abstract, theoretical, abstruse, philosophical) |
| numinous(abstract, theoretical, abstruse, philosophical) |
| obfuscated |
| omniscient(knowledgeable, cultured, educated, erudite, enlightened) |
| oracular(dark, strange, uncertain, mysterious, inexplicable) |
| out-of-the-way(adjective, obscure, new, complex, unknown) |
| out of view(expression, idiom, obscure, dark, unknown) |
| overhaul |
| oversubtle(abstract, theoretical, abstruse, philosophical) |
| pansophic(sound, knowledgeable, cultured, educated, erudite) |
| patch |
| perplexed |
| philosophic(sound, knowledgeable, abstract, cultured, educated) |
| philosophical(sound, deep, thoughtful, abstract, cultured) |
| polymath(sound, knowledgeable, cultured, educated, erudite) |
| posted(knowledgeable, cultured, educated, erudite, enlightened) |
| preternatural(obscure, deep, mysterious, abstract, theoretical) |
| professorial(sound, knowledgeable, cultured, educated, erudite) |