doubtless

adv.

1. Certainly: The wind was doubtless a factor.
2. Presumably; probably: as you doubtless already know.

adj.
Certain; assured.

doubtlessly doubt'less·ly adv.

adverb

Without question: absolutely, certainly, doubtlessly, positively, undoubtedly. See certain/uncertain, limited/unlimited.

adj

Definition: certainly; most likely
Antonyms: doubted, doubtedly, dubious, improbably, questionable, uncertain, unlikely

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IN BRIEF: adv. - With certainty.

You are doubtless the smartest one in class.

Dansk (Danish)
adv. - utvivlsomt, sandsynligvis
adj. - utvivlsom

Nederlands (Dutch)
ongetwijfeld, zeker

Français (French)
adv. - sans aucun doute, sans doute, très probablement
adj. - certain, probable

Deutsch (German)
adv. - zweifellos
adj. - fraglos, sicher

Ελληνική (Greek)
adv. - αναμφίβολα, βέβαια

Italiano (Italian)
indubbiamente

Português (Portuguese)
adv. - sem dúvida

Русский (Russian)
несомненный

Español (Spanish)
adv. - sin duda, a no dudarlo, a buen seguro, ciertamente, incuestionablemente
adj. - libre de dudas, cierto, seguro

Svenska (Swedish)
adv. - utan tvivel

中文（简体）(Chinese (Simplified))
无疑地, 确定地, 无疑的, 确定的

中文（繁體）(Chinese (Traditional))
adv. - 無疑地, 確定地
adj. - 無疑的, 確定的

한국어 (Korean)
adv. - 명확히, 아마도
adj. - 명확한

日本語 (Japanese)
adv. - 疑いもなく, 確かに, むろん, たぶん, おそらく
adj. - 疑いのない

العربيه (Arabic)
‏(ظرف) من غير ريب, في أغلب الظن‏

עברית (Hebrew)
adv. - ‮בלי ספק, כנראה‬
adj. - ‮בטוח ב-‬

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