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indubitable

[in-doo-bi-tuh-buh l, -dyoo-] /ɪnˈdu bɪ tə bəl, -ˈdyu-/
adjective
1.
that cannot be doubted; patently evident or certain; unquestionable.
Origin
1615-1625
1615-25; < Latin indubitābilis. See in-3, dubitable
Related forms
indubitability, indubitableness, noun
indubitably, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for in-dubitably

indubitable

/ɪnˈdjuːbɪtəbəl/
adjective
1.
incapable of being doubted; unquestionable
Derived Forms
indubitability, indubitableness, noun
Word Origin
C18: from Latin indubitābilis, from in-1 + dubitāre to doubt
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 in-dubitably

indubitable

adj.

mid-15c., from Latin indubitabilis "that cannot be doubted," from in- "not, opposite of" (see in- (1)) + dubitabilis "doubtful," from dubitare "hesitate, doubt" (see doubt).

Online Etymology Dictionary, © 2010 Douglas Harper
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3
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