Usage Note
Douter takes the preposition de when expressing doubt about something (douter de son honnêteté, to doubt his honesty). The reflexive se douter de has the opposite meaning: 'to suspect' or 'to have an inkling of' (je m'en doutais, I suspected as much). This reversal of meaning in the reflexive form is a classic learner trap. The noun doute means 'doubt'.
Examples
"Elle doute de sa propre capacité."
Natural Translation
She doubts her own ability.

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