There followed a voluminous screed of irrelevant dissertation.

That remark was so irrelevant that one could make no answer to it.

That was the line of his argument, and it was irrelevant enough to be almost insulting.

Yet this discursiveness is not so irrelevant to the handful of pages which follow.

You remind me of a passage in my story which I omitted, as irrelevant to the matter in hand.

There wasn't material and energy to spare for irrelevant details.

Irrelevant and immaterial to the facts at issue in the case.

Her next utterance struck me as irrelevant, to say the least of it.

He realized how irrelevant the last statement was only after he had made it.

It is fairer to suppose that it was passed over because it was irrelevant.