American English

Definition of reliable adjective from the Oxford Advanced American Dictionary



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  1. 1that can be trusted to do something well; that you can rely on synonym dependable We are looking for someone who is reliable and hard-working. a reliable friend My car's not as reliable as it used to be.
  2. 2that is likely to be correct or true Our information comes from a reliable source. a reliable witness How reliable are the local weather forecasts? These tests are a reliable indicator of future performance. opposite unreliable AWL Collocationsrelyrely verbto need something or someone and not be able to live or work well without it/him/herheavily entirely, exclusively, solely mainly, mostly, primarily, principally extensivelyThe author relies heavily on the primary sources of the literature.tend toLarger volume commercial fruit and vegetable growers tend to rely on migrant labor to harvest crops.reliability nounascertain, assess, evaluate improve ensure maximizeTo ensure the reliability of the experiments, all experiments were repeated two to three times.a degree of ~ a level of ~Higher-accuracy instruments provide increased levels of reliability and confidence.reliable adjectivescientifically, statistically highly fairly, reasonably, sufficientlyThe data set used is too small to yield statistically reliable conclusions.indicator, predictor estimate sourceThe authors conclude that consumer credit is one of the most reliable indicators of an advanced civilization.proveTall buildings soak up radio waves, so landline communications might prove more reliable.unreliable adjectiveinherently, intrinsically notoriously demonstrably wholly potentially statisticallyForecasters are notoriously unreliable at predicting things like the next wave of technological change. These models were statistically unreliable because of the very small sample sizes.render somethingTechnical difficulties in the design of experiments render data unreliable.provePrior efforts to identify this disorder proved unreliable and nounplace question decrease, lessen, reduce necessitate preclude entailThese findings suggest that new industries lessen reliance on agriculture.excessive, heavy, inordinate, undue exclusiveThe almost exclusive reliance on memoirs and letters tells us how strongly the biographical element dominates Frank's work.
  3. Word Familyrely verbreliable adjective (unreliable)reliably adverbreliability noun (unreliability)reliance noun
noun [uncountable] The incident cast doubt on her motives and reliability. The reliability of these results has been questioned. The aircraft has an exceptional record of reliability.
adverb I am reliably informed (= told by someone who knows the facts) that the company is being sold.
See the Oxford Advanced Learner's Dictionary entry: reliable