adverb
doubtless
DOWT-luhs
adverb
1
Almost certainly; very probably.
"He will doubtless complain about the schedule again."
"She is doubtless the most qualified candidate."
adjective
1
Free of doubt or uncertainty; certain.
"It is doubtless that the plan needs revising."
How to Use Doubtless
Learner’s notesIn plain EnglishAlmost certainly — a slightly formal way of saying "surely" or "no doubt."
Common mistake
Mostly used as an adverb ("doubtless he'll be late"), not as an everyday adjective — "no doubt" is the more common phrase in speech.
Common pairings
will doubtless
is doubtless
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Etymology
From Middle English douteles — doubt plus -less, "without."