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rational
理性りせい的てきに話し合おうはなしあおう。
Let's talk this through rationally.
彼かれの判断はんだんは理性りせい的てきで信頼しんらいできる。
His judgment is rational and trustworthy.
感情かんじょう的てきになりそうな場面ばめんでも理性りせい的てきに対処たいしょした。
Even when emotions were running high, he handled things rationally.