serious about
definitions
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To be deeply committed, dedicated, or earnest regarding a task, responsibility, or goal.fr: sérieux envers
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To be sincere or genuine in one's intentions, feelings, or proposals, rather than joking.fr: sincère à propos
examples
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He is very serious about his work.
Il est très sérieux concernant son travail.
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Are you serious about moving to another country?
Es-tu sérieux à propos de déménager dans un autre pays ?