irrelevant(not related, not applicable, unimportant, not connected) adjective [UK: ɪ.ˈre.lə.vənt] [US: ɪ.ˈre.lə.vənt]They are so irrelevant. = De är så irrelevanta.
moot(having no practical importance) adjective [UK: muːt] [US: ˈmuːt]
off-topic(not related to the matter being discussed) adjective