Proved effective over a long period of time: a time-tested recipe. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "time-tested" in a sentence
"A time-tested method to protect assets as people age is starting to blow up on baby boomers."
"Here are some examples of the time-tested arguments we're hearing from Big Oil:"
"Investors are abandoning the time-tested "stocks for the long run" optimism that dominated since the late 1980s."