
irrelevant
Not important or not significant for a particular topic or situation; immaterial.
Was du gestern gegessen hast, ist für diese Diskussion völlig irrelevant.
What you ate yesterday is completely irrelevant to this discussion.
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Not important or not significant for a particular topic or situation; immaterial.
Was du gestern gegessen hast, ist für diese Diskussion völlig irrelevant.
What you ate yesterday is completely irrelevant to this discussion.
The word is the opposite of 'relevant' (relevant). The prefix 'ir-' is a negation, similar to 'in-' or 'un-'. So if you know 'relevant' (important, significant), you can easily work out the meaning of 'irrelevant' (irrelevant).
Deine Meinung ist für diese Entscheidung leider irrelevant.
Unfortunately, your opinion is irrelevant to this decision.
'Irrelevant' is very often used with the preposition 'für' (for) and the accusative to say for whom or what something is not significant.
Ob du müde bist, ist für den Test irrelevant.
Whether you are tired is irrelevant to the test.
To strengthen the meaning, 'irrelevant' is often combined with adverbs such as 'völlig' (completely), 'absolut' (absolutely), or 'gänzlich' (entirely).
Sein Einwand war für die Diskussion völlig irrelevant.
His objection was completely irrelevant to the discussion.
indifferent / no matter
Egal and irrelevant can say that a piece of information makes no difference. Egal additionally expresses personal indifference or a lack of preference, while irrelevant emphasizes objective significance for a particular topic. Use irrelevant especially with a specific question, calculation, or decision.

Für die Berechnung des Preises ist die Farbe des neuen Fahrrads irrelevant.
The color of the new bicycle is irrelevant to calculating the price.
Mir ist egal, welche Farbe das neue Fahrrad hat.
I don't care what color the new bicycle is.