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reliable

[ri-lahy-uh-buh l]
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adjective
  1. that may be relied on or trusted; dependable in achievement, accuracy, honesty, etc.: reliable information.
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Origin of reliable

First recorded in 1560–70; rely + -able
Related formsre·li·a·bil·i·ty, re·li·a·ble·ness, nounre·li·a·bly, adverbnon·re·li·a·ble, adjectivenon·re·li·a·ble·ness, nounnon·re·li·a·bly, adverbqua·si-re·li·a·ble, adjectivequa·si-re·li·a·bly, adverbul·tra·re·li·a·ble, adjectiveul·tra·re·li·a·ble·ly, adverb

Synonyms

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trusty, authentic, consistent. Reliable, infallible, trustworthy apply to persons, objects, ideas, or information that can be depended upon with confident certainty. Reliable suggests consistent dependability of judgment, character, performance, or result: a reliable formula, judge, car, meteorologist. Infallible suggests the complete absence of error, breakdown, or poor performance: an infallible test, system, marksman. Trustworthy emphasizes the steady and honest dependability which encourages one's confidence, belief, or trust: trustworthy and accurate reports.

Antonyms

undependable, questionable, deceitful.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for non-reliable

reliable

adjective
  1. able to be trusted; predictable or dependable
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Derived Formsreliability or rare reliableness, nounreliably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for non-reliable

reliable

adj.

1560s, raliabill, Scottish; see rely + -able. Not common before 1850; and sometimes execrated thereafter in Britain as an Americanism because it involves a use of -able different from its use in provable, etc., but defended (by OED, Century Dictionary, etc.) on grounds of use of the suffix in available, laughable, etc.. Related: Reliably.

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Online Etymology Dictionary, © 2010 Douglas Harper