noun
nonexistence; nothingness
A literary or classical term for the state of not existing; often used in the set phrase 烏有に帰する (to come to nothing, to be reduced to nothing). Rare in everyday speech.
彼の努力は烏有に帰した。
His efforts came to nothing.
「烏有」は、何もないことを表す古い言葉だ。
烏有 is an old word meaning nothingness.