without doubt Definition

doubt
verb doubted, doubting

1. To feel uncertain about something; to be suspicious or show mistrust of it.

Thesaurus: distrust, mistrust, suspect, question, be skeptical; hesitate, vacillate, waver; Antonym: believe, trust.
2. To be inclined to disbelieve something.

noun

1. A feeling of uncertainty, suspicion or mistrust.
2. An inclination to disbelieve; a reservation.

Derivative: doubter
noun

Someone who is sceptical or has no faith
Thesaurus: disbeliever, cynic, skeptic, scoffer, agnostic; Antonym: believer.

Idiom: beyond doubt (beyond a shadow of a doubt)

Certain; certainly.

Idiom: in doubt

Not certain.

Idiom: no doubt

Surely; probably.
Thesaurus: doubtless, doubtlessly, presumably, surely, admittedly, assuredly, certainly, probably, unquestionably.

Idiom: without a doubt (without doubt)

Certainly.

Etymology: 15c in modern form; 13c as dute: from Latin dubitare.