truism[noun]Synonyms: cliché, axiom, bromide, commonplace, platitude
[TahlilGaran] English Synonym Dictionary ▲
tru‧is‧m /ˈtruːɪz
əm/
noun [countable] a statement that is clearly true, so that there is no need to say it:
His speech was just a collection of clichés and truisms. [TahlilGaran] Dictionary of Contemporary English ▲