Etymology
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doubtless (adv.)

"without doubt, without objection or uncertainty," late 14c., from doubt (n.) + -less. From late 14c. as an adjective, "beyond dispute, certain;" from mid-15c. as "free from doubt." Later in a weakened sense, indicating merely something that to the speaker seems likely to be true. Related: Doubtlessly.

updated on October 02, 2018

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Definitions of doubtless from WordNet

doubtless (adv.)
without doubt; certainly;
Synonyms: undoubtedly / doubtlessly
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.