truism
US /ˈtruː.ɪ.zəm/
UK /ˈtruː.ɪ.zəm/
1.
a statement that is obviously true and says nothing new or interesting
:
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It's a truism that you can't please all the people all the time.
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His speech was full of empty truisms.
a statement that is obviously true and says nothing new or interesting