Etymology
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indubitable (adj.)

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

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Definitions of indubitable

indubitable (adj.)
too obvious to be doubted;
Synonyms: beyond doubt
From wordnet.princeton.edu