tried and true vs tried

tried and true and tried both are adjectives.

Word	Noun	Adjective	Verb	Adverb
tried and true	No	Yes	No	No
tried	No	Yes	No	No

As adjectives, tried and true and tried are synonyms defined as:

Other synonyms of tried and true include tested, time-tested.

tried and true (adjective)	tried (adjective)
tested and proved to be reliable	tested and proved useful or correct
	tested and proved to be reliable