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unspeakable

[uhn-spee-kuh-buh l] /ʌnˈspi kə bəl/
adjective
1.
not speakable; that may not be spoken.
2.
exceeding the power of speech; unutterable; inexpressible; indescribable.
3.
inexpressibly bad or objectionable.
Origin
1350-1400
1350-1400; Middle English unspekeabill. See un-1, speakable
Related forms
unspeakableness, noun
unspeakably, adverb
Synonyms
2. ineffable, unimaginable.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un-speakably

unspeakable

/ʌnˈspiːkəbəl/
adjective
1.
incapable of expression in words unspeakable ecstasy
2.
indescribably bad or evil
3.
not to be uttered unspeakable thoughts
Derived Forms
unspeakableness, noun
unspeakably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for un-speakably

unspeakable

adj.

c.1400, "inexpressible," from un- (1) "not" + speakable (see speak). Meaning "indescribably bad or wicked" is recorded from 1831. Related: Unspeakably.

Online Etymology Dictionary, © 2010 Douglas Harper
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