Word: 理性 (lǐxìng) 理性 dictionary entry lǐxìng reason; rationality; rational Full dictionary entry for 理性 Example sentences using 理性 2 sentences, showing page 1 of 1. 人的行为不总是理性的。 Rén de xíngwéi bù zǒngshì lǐxìng de. People don't always behave rationally. 我感情上支持，但是理性上反对。 Wǒ gǎnqíng shàng zhīchí, dànshì lǐxìng shàng fǎnduì. I agree on an emotional level, but on the pragmatic level I disagree.