Unbelievable synonyms

incredible

The definition of incredible is something so unbelievable or so unusual that it is hard to believe.

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marvelous

Causing wonder; surprising, astonishing, or extraordinary

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shaky

Not dependable or reliable; questionable

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absurd

Having no rational or orderly relationship to people's lives; meaningless; lacking order or value.

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dubious

The definition of dubious is something that is unlikely to be true.

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miraculous

Pertaining to miracles; referring to something that people can't explain.

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staggering

Incredible, overwhelming, amazing.

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palpably false

Not to be believed

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believable (antonym)

Capable of eliciting belief or trust.

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phenomenal

(Sciences) Perceptible by the senses through immediate experience.

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extraordinary (related)

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appalling (related)

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unlikely (related)

Not likely; improbable; not to be reasonably expected; as, an unlikely event; the thing you mention is very unlikely. Not holding out a prospect of success; likely to fail; unpromising; as, unlikely means.

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astound (related)

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open to doubt

Not to be believed

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probable (antonym)

Likely or most likely to be true.

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credible (antonym)

That can be believed; believable; reliable

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past belief

Not to be believed

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questionable

Not definitely as specified; uncertain

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unveracious

Not veracious; untruthful; false.

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inconceivable

Unable to be conceived, unbelievable

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good (related)

(Especially when capitalized) Holy.

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false (related)

Not genuine or real:

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beyond-belief

Unbelievable

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unimaginable

Not conceivable in the imagination.

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not to be credited

Not to be believed

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doubtful

Unclear or unreliable

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amazing

The definition of amazing is full of wonder or excitement.

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astonishing

Causing astonishment in; causing to be astonished.

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fabulous

Hard to believe; incredible; astounding

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fantastic

Not believable; implausible; seemingly only possible in fantasy.

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impossible

Not possible, not able to be done.

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incredulous

1984, Supreme Court of Illinois, opinion in People v Terrell, 459 N.E.2d 1337, quoted in David C. Brody, James R. Acker, and Wayne A. Logan, Criminal Law, Jones & Bartlett Publishers (2001), ISBN 0-8342-1083-5, page 564,

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preposterous

The definition of preposterous is something that is absurd or ridiculous.

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weak

Lacking persuasiveness; unconvincing:

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likely (antonym)

(As predicate, followed by to and infinitive) Reasonably to be expected; apparently destined.