Intermediate (B1)
IPA: /ˈdaʊt.ləs/
KK: /ˈdaʊtləs/
Definition
Without any doubt; certain or sure about something.
Example
She is doubtless the best candidate for the job.
Conversation

Are you doubtless about your decision to move?

Yeah, I feel really good about it actually.

That's great to hear! I'm doubtless you'll find a better place.

Thanks! I just hope it all goes smoothly.
Synonyms & Antonyms
Synonyms
certain
sure
unquestionable
Antonyms
doubtful
uncertain
ambiguous
Definition
Without any doubt; certainly or probably true.
Example
Doubtless, she will succeed in her new job.
Conversation

I think the movie was really interesting, don't you?

Absolutely! The plot twists were doubtless unexpected.

Right? I was on the edge of my seat the whole time.
Root Explanation
Doubtless → It is formed from "doubt" (from Old French *douter*, meaning to fear or be uncertain) and "-less" (meaning without). The word "doubtless" means without doubt or certainly.
Memory Tip
Think of being 'without' ('-less') any 'fear or uncertainty' ('doubt') — that's why doubtless means certainly.
Visually Confused Words
dotless
devoutless
outbless
dustless
ductless
debtless
doless