reliable
Americanadjective
adjective
Synonym Usage
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.
Other Word Forms
Derived Forms
Etymology
Origin of reliable
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How does reliable compare to similar and commonly confused words? Explore the most common comparisons:
Explanation
Calling something reliable means you can count on it to come through when you need it; it's dependable. If you're headed out for an around-the-world sailing trip, hopefully your lifejacket is reliable. You can certainly rely on something reliable because it's trustworthy and responsible. Reliable people usually show up on time, never flake out, and always tell the truth. A reliable car isn't likely to break down and will get you from place to place safely. And if you happen to lose your trusty sidekick, good luck looking for a reliable replacement.
Vocabulary lists containing reliable
TEKS ELAR Academic Vocabulary List (5th-7th grades)
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Positive Words to Describe a Person
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"My Favorite Chaperone," Vocabulary from the short story
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
"By enabling robust nonreciprocal quantum synchronization, our research paves the way for realizing more reliable quantum processors and protected quantum resources," comments Lai.
From Science Daily • Jun. 12, 2026
And they are more likely to help if they see you as reliable and talented.
From MarketWatch • Jun. 12, 2026
The setup gives Nvidia a reliable earnings stream while allowing Sharon AI to expand its services to less moneyed customers, the companies said.
From Barron's • Jun. 12, 2026
There are no reliable figures for the death toll, but it is thought to be at least 50,000.
From BBC • Jun. 11, 2026
Girls from Central are here as well; reliable Helen has ably taken over the kitchen, washing guests’ teacups as soon as they dirty.
From "The Brightwood Code" by Monica Hesse
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
