Truism
Etymology
Coined in the early 18th century from "true" plus the suffix "-ism," on the model of words like "witticism." It has always carried a faint sting: a truism is true, but trivially so.
noun · /TROO-iz-um/
A statement so obviously true that saying it adds nothing.
What it names
A precise label for the empty, self-evident remark that masquerades as insight — useful for naming filler dressed up as wisdom.
Example
"Change is hard" is a truism — accurate, and utterly useless as advice.
Related idea
A platitude is a truism deployed as if it were comforting or profound; the truism is merely obvious, while the platitude is obvious and pretending otherwise.