indubitable

[in-doo-bi-tuh-buhl, -dyoo-]
adjective
that cannot be doubted; patently evident or certain; unquestionable.

Origin:
1615–25; < Latin indubitābilis. See in-3, dubitable

indubitability, indubitableness, noun
indubitably, adverb
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World English Dictionary
indubitable (ɪnˈdjuːbɪtəbəl)
 
adj
incapable of being doubted; unquestionable
 
[C18: from Latin indubitābilis, from in-1 + dubitāre to doubt]
 
indubita'bility
 
n
 
in'dubitableness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

indubitable
1625, from L. indubitabilis "that cannot be doubted," from in- "not" + dubitabilis "doubtful," from dubitare "hesitate, doubt" (see doubt).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The railroad track-layer is an indubitable and decided success.
Carriers must receive irrevocable financial guarantees of indubitable value and unquestionable right of recourse.
Partial transfer of collateral in full satisfaction of debt failed to give creditor indubitable equivalent of secured claim.
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