Found 2 items, similar to Doubtlessly.
English → English (WordNet) Definition: doubtless doubtless adv : with certainty; “it's undoubtedly very beautiful” [syn: undoubtedly, beyond question, without doubt, beyond any doubt]
English → English (gcide) Definition: Doubtlessly Doubtlessly \Doubt"less*ly\, adv. Unquestionably. --Beau. & Fl. [1913 Webster]