to be a certainty, to be clear

feminine singular of douteux

female equivalent of douteur

doubtful, uncertain, questionable (issue, outcome, date etc.) / dubious, questionable (morals, qualities etc.) / rather unclean (piece of clothing)

(followed by the preposition de) to doubt / (reflexive) to suspect, to have an inkling

second-person singular present indicative/subjunctive of douter / doubts, misgivings (apprehension)

inflection of douter:
/ inflection of douter:

third-person plural present indicative/subjunctive of douter

third-person singular future of douter

first-person plural future of douter