taru-adjective, adverb taking the 'to' particle, noun which may take the genitive case particle 'no', noun
Literary word describing something dark, invisible, or hidden from sight. Often used in fixed expressions like 冥々のうちに (unseen, in the dark) or 冥々の世界 (the world of the dead).
冥々のうちに、運命は決まっているのかもしれない。
Perhaps fate is decided unseen, in the dark.
彼は冥々の世界へ旅立った。
He departed for the world of the dead.
The exact derivation is uncertain; the kanji 冥 and 瞑 both carry meanings of 'dark' or 'close the eyes', and the reduplicated form emphasizes the state of being dark or invisible.