serious about
definitions
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To be deeply committed, dedicated, or earnest regarding a task, responsibility, or goal.ja: ~に真剣な
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To be sincere or genuine in one's intentions, feelings, or proposals, rather than joking.ja: 本気である
examples
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He is very serious about his work.
彼は仕事に対して非常に真剣です。
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Are you serious about moving to another country?
他の国へ移住することについて本気ですか?