abstruse Synonyms

recondite deep metempirical perplexing professorial profound profoundness puzzling rarefied recherche secret subtle supermundane pedantical orphic methodological mysterial mysterious mystic mystical mystifying obfuscated obscure occult ontological opaque oracular supramundane technical technological unknowable well-educated little-known low profile nonmaterial nonrational unclear over one's head pansophic subliminal under wraps under-the-table kabbalistic high tech telestic transcendental vague vapory veiled wildering