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Douter vs. se douter

Word practice demo
The French verbs douter and se douter look similar but have nearly opposite meanings. Douter expresses uncertainty or disbelief, while the reflexive form se douter expresses a suspicion or a hunch that something is true.

Douter

B1
The verb douter means to doubt, to question, or to be uncertain about something. It conveys a sense of skepticism or a lack of conviction. It is often followed by the preposition de or by que with a verb in the subjunctive mood.
Je doute de la véracité de cette histoire.
(I doubt the truthfulness of this story.)
Elle doute que nous puissions finir le projet à temps.
(She doubts that we can finish the project on time.)
Les experts doutent de l'efficacité de cette nouvelle mesure.
(The experts doubt the effectiveness of this new measure.)
Il a promis de m'aider, mais j'en doute fort.
(He promised to help me, but I strongly doubt it.)
Ne doute jamais de tes propres capacités.
(Never doubt your own abilities.)

Se douter

B2
The reflexive verb se douter means to suspect, to have a hunch, to guess, or to imagine. It indicates an intuition or a strong feeling that something is true or is likely to happen. It is often followed by de or by que with a verb in the indicative mood.
Je me doutais que tu dirais cela.
(I suspected you would say that.)
Elle se doute de la surprise que nous lui préparons.
(She suspects the surprise we are preparing for her.)
Il a ouvert la porte sans faire de bruit, mais elle ne se doutait de rien.
(He opened the door without making a sound, but she didn't suspect a thing.)
Nous nous sommes doutés qu'il y avait un problème dès que nous l'avons vu.
(We suspected there was a problem as soon as we saw him.)
Tu te doutes bien que la réponse n'est pas si simple.
(You can well imagine that the answer is not so simple.)

Summary

In short, use douter when you lack belief and are uncertain (to doubt). Use se douter when you have an intuition or a suspicion that something is actually true (to suspect). The key difference is disbelief (douter) versus suspicion (se douter).