
uninteressant
uninteresting
Not arousing interest or curiosity; boring.
Ich fand den Vortrag leider völlig uninteressant.
Unfortunately, I found the lecture completely uninteresting.
uninteresting
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uninteresting
Not arousing interest or curiosity; boring.
Ich fand den Vortrag leider völlig uninteressant.
Unfortunately, I found the lecture completely uninteresting.

irrelevant
Not important or relevant; insignificant.
Ob er zugestimmt hat oder nicht, ist für die endgültige Entscheidung uninteressant.
Whether he agreed or not is irrelevant for the final decision.
The adjective has a simple structure: it consists of the prefix 'un-', which expresses negation, and the word 'interessant' (interesting). 'Uninteressant' (uninteresting) is therefore the direct opposite of 'interessant' (interesting).
Für mich sind politische Diskussionen oft uninteressant.
For me, political discussions are often uninteresting.
When 'uninteressant' has the meaning 'insignificant' or 'irrelevant', it is often used with the preposition 'für' + accusative. This construction expresses the context in which something plays no role.
Deine persönliche Meinung ist für diese Entscheidung völlig uninteressant.
Your personal opinion is completely irrelevant for this decision.
The meaning 'boring' often describes a personal feeling, e.g. 'Ich finde das Thema uninteressant.' (I find the topic uninteresting). The meaning 'insignificant', on the other hand, describes objective irrelevance for a specific purpose, e.g. 'Diese Information ist für den Fall uninteressant.' (This information is irrelevant for the case).
Ich finde diesen Film ziemlich uninteressant.
I find this film pretty uninteresting.
boring
A movie or presentation can be boring or uninteresting when it offers little appeal. “Langweilig” emphasizes more strongly that you actually experience boredom. “Uninteressant” mainly says that the subject does not spark personal interest or curiosity. Both words are possible in this context.

Der Film war für mich uninteressant, weil mich sein Thema nicht neugierig machte.
The movie was uninteresting to me because its subject did not make me curious.
Der Film war langweilig, sodass ich nach einer halben Stunde müde wurde.
The movie was boring, and I became tired after half an hour.