1 adj People or things that are reliable can be trusted to work well or to behave in the way that you want them to.
She was efficient and reliable..., Japanese cars are so reliable.
It's been working reliably for years.
He's not at all worried about his car's reliability.
2 adj Information that is reliable or that is from a reliable source is very likely to be correct.
There is no reliable information about civilian casualties...
Sonia, we are reliably informed, loves her family very much.
Both questioned the reliability of recent opinion polls.
Translation English - Cobuild Collins Dictionary
certain, dependable, faithful, honest, predictable, regular, reputable, responsible, safe, sound, stable, staunch, sure, tried and true, true, trustworthy, trusty, unfailing, upright
irresponsible, undependable, unreliable, untrustworthy
English Collins Dictionary - English synonyms & Thesaurus
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"