What is the meaning of doubtless?

adverb

14
 
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APAWordNet. (2010). doubtless. Retrieved May 26, 2019, from http://smartdefine.org/doubtless/definitions/1251304
ChicagoWordNet. 2010. "doubtless" http://smartdefine.org/doubtless/definitions/1251304 (accessed May 26, 2019).
HarvardWordNet 2010, doubtless, Smart Define, viewed 26 May, 2019, <http://smartdefine.org/doubtless/definitions/1251304>.
MLAWordNet. "doubtless" 23 October 2010. Web. 26 May 2019. <http://smartdefine.org/doubtless/definitions/1251304>
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