IPA: /ˈtruːɪzəm/
KK: /ˈtruːɪzəm/
A statement that is so obvious or simple that it doesn't need to be explained or discussed.
The idea that hard work leads to success is a common truism.
Truism is formed from "true" (from Old English *triewe*, meaning faithful or genuine) and the suffix "-ism" (meaning a doctrine or belief). The word refers to a statement that is obviously true and requires no proof, often seen as a self-evident truth.
Think of something that is 'genuinely' true ('true') and a belief or doctrine ('-ism') — a truism is a statement that is obviously true.