doubt, uncertainty / question

certainly; surely; without doubt (emphatic affirmative answer)

Used other than figuratively or idiomatically: see na, dúvida. / just to be safe (it should be done even though it may not be necessary)

benefit of the doubt (a favourable judgement given in the absence of full evidence)

plural of benefício da dúvida

(idiomatic) shadow of a doubt (any minor doubt or hesitation)

plural of dúvida