Synonyms: tested, time-tested, tried, tried and true
Definition: tested and proved to be reliable
Similar words: reliable, dependable
Definition: worthy of reliance or trust
Usage: a reliable source of information; a dependable worker
Synonyms: tried, tested, well-tried
Definition: tested and proved useful or correct
Usage: a tested method
Definition: established beyond doubt
Usage: a proven liar; a Soviet leader of proven shrewdness