not related to the topic
His comment was irrelevant to the discussion at hand.
Vocabulary like irrelevant appears on the Digital SAT in Words-in-Context questions, where you choose the word that fits a passage's meaning and tone. You can also drill this word with vocabulary flashcards.
reverse; make an inversion (in a musical composition)
examine; investigate scientifically
invulnerable; incapable of being transgressed or dishonored
call forth; summon into action or bring into existence, often as if by magic
angry; quickly aroused to anger
annoying; so lacking in interest as to cause mental weariness
amusing; humorously sarcastic or mocking
illogical; not consistent with or using reason
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