Doubtless

Adjective

 * 1) Characterized by or experiencing no doubt at all, certain; undoubted; undoubting.
 * 2) * 1880, B. Stewart and P. G. Tait, The Unseen Universe, Macmillan (London), p. xiii:
 * There are those who have doubtless faith in revelation.
 * 1) * 1927, Edgar Rice Burroughs, The Outlaw of Torn, ch. 7:
 * It is doubtless that the old reprobate who sued for his daughter's hand heard some unsavory truths from the man.

Adverb

 * 1) Without doubt; very probably, in all likelihood; doubtlessly.
 * 2) * 1893, Ambrose Bierce, "The Realm Of The Unreal":
 * I cannot remember that I spoke a word, though doubtless I did.
 * 1) * 1900,, :
 * The men, Dorothy thought, were about as old as Uncle Henry, for two of them had beards. But the little woman was doubtless much older. Her face was covered with wrinkles, her hair was nearly white, and she walked rather stiffly.

Thesaurus
absolutely, admittedly, assumably, assured, believing, beyond doubt, beyond question, by all odds, certain, certainly, confident, convinced, definitely, devout, dogmatic, dollars to doughnuts, doubtlessly, faithful, fideistic, for certain, for sure, impressed with, in all likelihood, in all probability, incontestably, indisputably, indubious, indubitably, irrefragably, irrefutably, like enough, likely, make no mistake, most likely, naturally, no doubt, out of question, past dispute, persuaded, pietistic, pious, pistic, positive, positively, presumably, presumptively, probably, questionless, satisfied, secure, sold on, supposedly, sure, surely, ten to one, truly, unchallenged, uncontested, uncontradicted, uncontroversial, uncontroverted, undeniably, under the impression, undisputed, undoubted, undoubtedly, undoubtful, undoubting, unequivocally, unquestionably, unquestioned, very like, very likely, without doubt

Etymology
From.

Adjective

 * Bulgarian: несъмнено, безспорно, сигурно


 * Polish: bez wątpliwości
 * Russian: несомненный

Derived terms

 * doubtlessness

Synonyms

 * indubitably, undoubtedly, unquestionably

Derived terms

 * doubtlessly