doubtlessly C2+ Topic:Mind & Cognition US /ˈdaʊtləsli/ UK /ˈdaʊtləsli/ See IPA manual Meanings 1 adv without doubt; certainly He will doubtlessly arrive late, as he always does. Thesaurus Synonyms 1 adv · without doubt; certainly certainlyundoubtedlysurelyassuredlyunquestionablyindubitably ↔ Opposites doubtfullyuncertainly Word family Related forms doubtdoubtlessdoubtful Etymology AI details From doubtless + -ly; doubtless is from doubt + -less, doubt from Old French douter, from Latin dubitare ('to waver'). douter Old French dubitare Latin dubius Latin View etymology graph -> Topics Mind & Cognition Word Formation & Derivatives External links Cambridge Dictionary Wiktionary Google Images # doubtlessly **Type:** Word **Level:** C2+ **Part of speech:** adv **IPA (US):** /ˈdaʊtləsli/ **IPA (UK):** /ˈdaʊtləsli/ ## Meanings 1. without doubt; certainly ## Examples - He will doubtlessly arrive late, as he always does. ## Synonyms - certainly - undoubtedly - surely - assuredly - unquestionably - indubitably ## Antonyms - doubtfully - uncertainly ## Related Forms - doubt - doubtless - doubtful ## Roots and Affixes - Root: douter - Root: dubitare - Root: dubius ## Etymology From doubtless + -ly; doubtless is from doubt + -less, doubt from Old French douter, from Latin dubitare ('to waver'). ## AI Etymology Doubtlessly is from doubtless + -ly; doubtless is from doubt + -less, doubt from Old French douter, from Latin dubitare ('to waver'). Important recorded forms include douter (Old French), dubitare (Latin), and dubius (Latin). Morphologically, the word is a built form whose named elements carry part of the historical sense. The current sense covers without doubt; certainly. The wider family includes related words such as doubt, doubtless, and doubtful. ## Topics - Mind & Cognition - Word Formation & Derivatives markdown