- , undoubtedly, indubitably"Tonight he faces what is doubtlessly the toughest and loneliest choice of his 13-year stewardship of the Palestine Liberation Organization" (Washington Post). Since doubtless can be an adverb as well as an adjective, there is no need to add -ly to it. Undoubtedly would have been a better choice still because, as the Evanses note, it has a less concessive air. Doubtless usually suggests a tone of reluctance or resignation: "You are doubtless right." Undoubtedly carries more conviction: "You are undoubtedly right." Indubitably is a somewhat jocular synonym for either.
Bryson’s dictionary for writers and editors. 2013.
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doubtless — doubtless, no doubt, undoubtedly, doubtlessly 1. Fowler (1926) rightly noted that doubtless and no doubt, used adverbially, convey probability rather than certainty about what follows, so that They are doubtless [or no doubt] guilty and No doubt… … Modern English usage
Doubtless — Doubt less, a. Free from fear or suspicion. [Obs.] [1913 Webster] Pretty child, sleep doubtless and secure. Shak. [1913 Webster] … The Collaborative International Dictionary of English
Doubtless — Doubt less, adv. Undoubtedly; without doubt. [1913 Webster] … The Collaborative International Dictionary of English
doubtless — index axiomatic, categorical, certain (positive), clear (certain), definite, demonstrable, indubi … Law dictionary
doubtless — mid 14c. (adv.), mid 15c. (adj.), from DOUBT (Cf. doubt) + LESS (Cf. less). Related: Doubtlessly … Etymology dictionary
doubtless — [adv] certainly; most likely absolutely, apparently, assuredly, clearly, easily, for sure, indisputably, no ifs ands or buts*, of course, ostensibly, positively, precisely, presumably, probably, seemingly, supposedly, surely, truly, undoubtedly,… … New thesaurus
doubtless — ► ADVERB ▪ very probably. DERIVATIVES doubtlessly adverb … English terms dictionary
doubtless — [dout′lis] adj. [ME douteles] Rare free from doubt; sure adv. 1. without doubt; certainly 2. probably doubtlessly adv. doubtlessness n … English World dictionary
doubtless — [[t]da͟ʊtləs[/t]] ADV: ADV with cl/group If you say that something is doubtless the case, you mean that you think it is probably or almost certainly the case. He will doubtless try and persuade his colleagues to change their minds... Doubtless he … English dictionary
doubtless — doubtlessness, n. /dowt lis/, adv. Also, doubtlessly. 1. without doubt; certainly; surely; unquestionably. 2. probably or presumably. adj. 3. free from doubt or uncertainty; certain, sure. [1300 50; ME douteles. See DOUBT, LESS] Syn. 1, 2.… … Universalium