adverb Also, doubtlessly.
without doubt; certainly; surely; unquestionably.
probably or presumably.
free from doubt or uncertainty; certain, sure.

1300–50; Middle English douteles. See doubt, -less

doubtlessness, noun

1, 2. Doubtless, undoubtedly, indubitably, unquestionably are adverbs that express certainty. Doubtless although it sometimes denotes an absolute degree of certainty, more often means “probably,” “presumably,” or “no doubt”: She will doubtless accept the offer. Undoubtedly means “beyond doubt”: undoubtedly the most prolific and popular composer of his time. Indubitably and unquestionably both affirm an unassailable conviction; they differ only in tone, indubitably being appropriate to more formal or learned discourse and unquestionably appropriate in a wider range of contexts and styles: an indubitably (or unquestionably) accurate transliteration of the hieroglyphic text; unquestionably the hottest running back in the league. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
doubtless (ˈdaʊtlɪs)
1.  certainly
2.  probably
3.  certain; assured

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 14c. (adv.), mid-15c. (adj.), from doubt + -less.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They will doubtless suggest the sign language of the deaf.
He will doubtless have opportunity for wiser comprehension of those who differ from him politically.
Deng is doubtless out there tonight, plotting under his tree.
Where, doubtless, some fine minds will contribute further insights.
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