trueism

Noun

truism (plural truisms)

1. A self-evident or obvious truth.
   • It is a truism that the site of stations is conditioned by history and geography, but Dover Marine especially owes its fascinating and unusual layout to these two factors.1959 October, T. W. E. Roche, “Traffic Working at Dover Marine Station”, in Railway Magazine, page 677

   Synonyms:

   lapalissade, platitude

2. A banality or cliché.
   • After a little decent sorrow had been put forth for the late "severe affliction," joined with some weariful truisms about resignation to the will of Providence, the rest of the epistle was filled up with reproofs about her ladyship's extraordinary and improper conduct in setting off without his...1837, L[etitia] E[lizabeth] L[andon], “The Remembrance of the Dead”, in Ethel Churchill: Or, The Two Brides. […], volume II, London: Henry Colburn, […], →OCLC, page 321

   Synonyms:

   platitude, byword, saying, adage, saw, proverb, maxim, apothegm, apophthegm, dictum