doubtless

[ dout-lis ]
/ ˈdaʊt lɪs /

adverb Also doubt·less·ly.

without doubt; certainly; surely; unquestionably.
probably or presumably.

adjective

free from doubt or uncertainty; certain, sure.

Origin of doubtless

First recorded in 1300–50, doubtless is from the Middle English word douteles. See doubt, -less

OTHER WORDS FROM doubtless

doubt·less·ness, noun

synonym study for doubtless

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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for doubtless

British Dictionary definitions for doubtless

doubtless
/ (ˈdaʊtlɪs) /

adverb Also: doubtlessly (sentence substitute or sentence modifier)

certainly
probably

adjective

certain; assured

Derived forms of doubtless

doubtlessness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012