na-adjective, noun which may take the genitive case particle 'no', noun
unrelated; irrelevant; having nothing to do with
Describes a lack of connection, involvement, or relevance. Commonly used as 無関係な or 無関係の to modify nouns, and in patterns like ～とは無関係だ.
I have nothing to do with that incident.
年齢は能力と無関係だ。
Age is unrelated to ability.
This incident has nothing to do with him.
Anyone can participate regardless of age.
That story is completely unrelated.
I got caught up in an incident unrelated to him.
無関係 means having no connection or involvement at all, the direct opposite of 関与, which means being involved in something.
無関係 means having no relationship at all, the direct opposite of 相関, which describes two things being mutually connected.
無関係 means having no relation at all, the direct opposite of 連関, which describes things being interconnected.