Where does “doubtless” come from?

Doubtless comes from Middle English douteles, from Middle English doute, from Old French doute, from Old French douter meaning "to doubt," from Latin dubitāre meaning "to waver between two things," from Latin duo meaning "two."

doubtless (English): Characterized by or experiencing no doubt at all,...

Definitions

Characterized by or experiencing no doubt at all,...

Ancestry of “doubtless”, step by step

Step	Language	Word	Meaning
1	Middle English	douteles	doubtless
2	Middle English	doute	doubt
3	Old French	doute	doubt
4	Old French	doter	to doubt; to fear; to be afraid
5	Latin	dubitō	to waver (in opinion), be uncertain, doubt, question, be in doubt
6	Latin	dubō	—
7	Latin	*dubos	—
8	Indo-European	*bʰuH-	—

Words derived from “doubtless”

doubtlessness

Every word from Indo-European *bʰuH- →Every word from Latin *dubos →Every word from Latin dubō →