in·du·bi·ta·ble

[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

in·du·bi·ta·bil·i·ty, in·du·bi·ta·ble·ness, noun
in·du·bi·ta·bly, adverb
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World English Dictionary
indubitable (ɪnˈdjuːbɪtəbəl) [Click for IPA pronunciation guide]
 
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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00:10
Indubitable is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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.
Partial transfer of collateral in full satisfaction of debt failed to give creditor indubitable equivalent of secured claim.
Carriers must receive irrevocable financial guarantees of indubitable value and unquestionable right of recourse.
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