that may be relied on; dependable in achievement, accuracy, honesty, etc.: reliable information.

1560–70; rely + -able

reliability, reliableness, noun
reliably, adverb
nonreliable, adjective
nonreliableness, noun
nonreliably, adverb
quasi-reliable, adjective
quasi-reliably, adverb
ultrareliable, adjective
ultrareliablely, adverb

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.

undependable, questionable, deceitful. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reliable (rɪˈlaɪəbəl)
able to be trusted; predictable or dependable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1569, raliabill, Scottish, from rely + -able. Not common before 1850; and execrated thereafter in Britain as an Americanism.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Fin-soup demand is driving millions of shark deaths, according to what
  researchers say are the first reliable estimates.
Found in cool, coastal waters throughout the world, there is no reliable data
  on the great white's population.
Winter may be a more reliable period for sightseeing.
Our fish farm supplies a new, reliable revenue source that will ultimately pay
  for the full-time groundskeeper we've hired.
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