late 15c., "not endowed with reason" (of beats, etc.); earlier (of quantities) "inexpressible in ordinary numbers" (late 14c.); from Latin irrationalis "without reason," from assimilated form of in- "not, opposite of" (see in- (1)) + rationalis "reason" (see rational). Meaning "illogical, absurd" is attested from 1640s. Related: Irrationally.
实用例句
1. The rational and the irrational complement each other. Individually, they are far less powerful.
理性和非理性是互补的。两者分开的话，力量就会小很多。
来自美剧《纸牌屋》
2. His behaviour was becoming increasingly irrational.
他的行为变得越来越不理智了。
来自柯林斯例句
3. The weight of irrational guilt pressed on her.
无端的负罪感压得她喘不过气来。
来自柯林斯例句
4. After taking the drug she became completely irrational.
她在吸毒后变得完全失去了理性.
来自《简明英汉词典》
5. Strong irrational dislikes of other people can easily be picked up from others.