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.

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.
important
'wichtig' and 'uninteressant' can be opposites when 'uninteressant' means that something has no significance or relevance. 'wichtig' then means: it plays a role. 'uninteressant' means: it plays no role in this matter. But 'uninteressant' can also simply mean 'boring'. In that case, it is not exactly the opposite of 'wichtig'. So pay attention to whether it is about significance or about interest.

Für den Vertrag ist diese alte Nachricht uninteressant.
This old message is irrelevant for the contract.
In der Küche ist sauberes Wasser für das Kind wichtig.
In the kitchen, clean water is important for the child.