Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Not to be believed; incredible: unbelievable luck.
Century Dictionary and Cyclopedia
- Not to be believed; incredible.
Wiktionary
- adj. Not to be believed.
- adj. Incredible; so surprising it is almost unable to believe.
- adj. Implausible or improbable.
WordNet 3.0
- adj. having a probability too low to inspire belief
- adj. beyond belief or understanding
Etymologies
- From un- + believe + -able. (Wiktionary)
Examples
“Outside court, Mr. Boyland expressed relief and thanked his legal team and supporters, repeating the word "unbelievable" three times.”
“It produces heroic strivings for evidence to prove that the unbelievable is the only thing that can be believed .....”
“A member of the rebels fighting forces loyal to Libyan leader Moammar Gadhafi says his group is concerned that the international community has been unable to stop what he describes as the unbelievable atrocities being committed by Gadhafi forces against unarmed Libyans in Misrata and Zawiya.”
Voice of America: Libyan Rebel: NATO Unable to Halt Atrocities
“The word 'unbelievable' is constantly used in sports.”
“Thanks for a land that truly defines the word "unbelievable".”
“As well as what he describes as the unbelievable fish, he praises the first-class vegetables, delicious rice pudding, exemplary tiramisu, a couple of brilliant scroppinos”
“The word "unbelievable" is overused these days, but let us take a moment to review this incredible turn of events.”
The Huffington Post: Robert Rosenthal: Wall Street Bad Boy May Face Cameras, Not Prison
“No, what's unbelievable is that someone thinks this posting means anything in English.”
“What I find utterly unbelievable is that some people do not realize the magnitude of the economic problems we are in, especially the duration (8 years or more) that it took us to get to this point.”
“What I find unbelievable is that institutions would.”
Lists
These user-created lists contain the word ‘unbelievable’.
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Apples to Apples: Green Cards
A complete list of the green cards (adjectives) from the popular word game.
absurd, addictive, adorable, aged, American, ancient, animated, annoying, appetizing, arrogant, awesome, awkward and 237 more...
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farfetched
farfetched, improbable, long shot, implausible, don't hold your b..., beggar belief, unbelievable, unlikely, inconceivable, pipe dream
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luckylime's Words
cacophony, cascade, trigger, crunch, vellum paper, arduous, luminescent, voluminous, euphoric, bucolic, diaphanous, danger and 162 more...
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song starters (twisted song starters)
Words/phrases inextricably tied to the songs they're in, sparking off earworms here there & everywhere (there's one, to start with). Only my own personal examples.
Do guess the more p...as i recall, here there and ev..., firestarter, final countdown, every now and then, turn around, pipe wrench, goodness gracious, insane, fuck you, scat, 21 seconds and 80 more...
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5yllable5's Words
educational, hydroelectric, kapiolani, kamehameha, serendipitous, procrastination, abomination, inexplicable, hypothetical, tyrannosaurus, miscellaneous, disingenuous and 79 more...
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weird
strange, unusual, out of the box, different, diverse, unique, weird, unbelievable, impossible, catnip, domineering, somnambulist and 20 more...
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angelken's Words
apple, ipod, macbook pro, leopard, tiger, angel, motion, mule, renaissance, iphone, google, aqua and 15 more...
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positive hyperbole (adjectives)
wonderful, splendid, marvelous, incredible, unbelievable, magnificent, amazing, stupendous, tremendous, terrific, fantastic, fabulous and 3 more...
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Contronympho
A list of my most favorite contronyms, words that 'defeat themselves' by having multiple-meanings which contradict. Also called antagonyms, auto-antonyms, autantonyms, Janus words, and self-antony...
over, identify, clear, before, execute, bolt, custom, garnish, left, off, charge, save and 56 more...
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meganashley's Words
mundane, hypothalamo neuro..., phenylalanine, morphology, banal, fedex, pimpology, scrabble, rhythmus, oblivion, paradigm, dogmatic and 43 more...
Tweets
Looking for tweets for unbelievable.

sarra ouch, that was loud. Mar 11, 2011
sarra DAUWN, DAUWN, DAUWN DANAUWN DANAUWM DAANAANAOUWM, DAUWN DANAAANANAUWN DAUWN etc Mar 11, 2011
whichbe Contronym: both a term of contempt and admiration. Oct 8, 2008