Also means
to question
Usage Note
Dubitare is typically followed by di + infinitive or che + subjunctive: dubito che venga (I doubt he'll come) — note the required subjunctive. It takes avere as auxiliary. A common phrase is non c'è da dubitare (there's no reason to doubt). The related noun is dubbio (doubt), and the adjective dubbioso means doubtful or uncertain.
Examples
"Dubito che arrivi in tempo."
Natural Translation
I doubt he'll arrive on time.
Literal Translation
I-doubt that he-arrive (subj.) in time.

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