tested vs time-tested

tested and time-tested both are adjectives.

Word	Noun	Adjective	Verb	Adverb
tested	No	Yes	No	No
time-tested	No	Yes	No	No

As adjectives, tested and time-tested are synonyms defined as:

Other synonyms of tested include tried, tried and true.

tested (adjective)	time-tested (adjective)
tested and proved useful or correct	tested and proved to be reliable
tested and proved to be reliable