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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.
important
'wichtig' and 'irrelevant' form a contrast, especially when it is about a particular topic or decision. 'wichtig' says that something has significance and should be taken into account. 'irrelevant' says that something plays no role in this context. 'irrelevant' often sounds a little more objective than 'unwichtig' and is often used in discussions, work-related topics, or decisions. In practical terms: a piece of information can be interesting in general, but irrelevant to a specific question.
Für diese Entscheidung ist der alte Preis irrelevant.
The old price is irrelevant for this decision.
Wegen des Sturms ist der neue Termin morgen besonders wichtig.
Because of the storm, the new appointment tomorrow is especially important.