time-tested

[ tahym-tes-tid ]
/ ˈtaɪmˌtɛs tɪd /

adjective

having proved valid, workable, or useful over a long span of time: a time-tested theory.

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Origin of time-tested

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020