'Indubious' definitions:
Definition of 'Indubious'
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Indubious \In*du"bi*ous\, a. [L. indubius. See In- not, and
Dubious.]
[1913 Webster]
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1. Not dubious or doubtful; certain.
[1913 Webster]
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2. Not doubting; unsuspecting. "Indubious confidence."
--Harvey.
[1913 Webster]