The adjective timeworn is good for describing something that's been said or done so often that it's not interesting or fresh any more. A movie with a timeworn plot has few surprises.

The joke your dad tells every year at Thanksgiving has probably become timeworn, and the meal itself may seem a bit timeworn. A local government's timeworn way of not dealing with problems may finally inspire voters to make a change. Timeworn is a word that first appeared in the 1700's, sometimes spelled with a hyphen: time-worn.

Definitions of timeworn

adj repeated too often; overfamiliar through overuse

“parroting some timeworn axiom”
banal, commonplace, hackneyed, old-hat, shopworn, stock, threadbare, tired, trite, well-worn
not original; not being or productive of something fresh and unusual

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