the.com/truism

A statement so true it stopped doing any work decades ago.

means A statement that is obviously and self-evidently true, often to the point of being trivial or uninformative.

from Built in English from 'true' plus the suffix '-ism,' which here marks a type of statement or doctrine, much like 'witticism' marks a type of remark — the word surfaced around the turn of the 19th century as writers needed a term for assertions so obviously correct they barely counted as saying anything.

definition
Obviously true statement, usually offered as insight
example
Everything happens for a reason happens to mean nothing
danger
Sounds wise, replaces actual thinking
cousin
Related to cliche, but technically unfalsifiable
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