noun, noun which may take the genitive case particle 'no'
wicked and perverse; weird and incoherent
A yojijukugo describing people or things that are morally twisted, bizarre, or nonsensical. Rare in modern conversation; mostly encountered in literary or formal contexts.
彼の言動はまさに牛鬼蛇神だ。
His words and actions are truly wicked and perverse.
この小説には牛鬼蛇神のような登場人物が多く出てくる。
Many characters like freaks and monsters appear in this novel.
The exact derivation is uncertain; the kanji literally mean 'ox demon snake god', suggesting a collection of monstrous or bizarre beings, used figuratively for wickedness or incoherence.