adjective
1.
having qualities that merit confidence or trust
a reliable friend
Synonyms: dependable, secure, tried, tried and true, trustworthy, trusty
Related Word: safe; inerrable, inerrant, infallible, unerring; apposite, cogent, compelling, convincing, meaningful, significant, sound, telling, valid; attested, authenticated, circumstantiated, confirmed, proven, validated, verified; unimpeachable, unquestionable
Contrasted words: doubtful, dubious, problematic, questionable, suspect; independable, undependable, untried, untrustworthy; unattested, unauthenticated, unconfirmed, unvalidated
Antonyms: unreliable
2.
Synonyms: certain 3, accurate, authentic, dependable