irrational

• adj. 理不尽な; 不合理な; 不合理な
• n. [数]不合理な数

ir-, not, 非合理的, 合理的, 論理的.

irrational (adj.)

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.

1. The rational and the irrational complement each other.Individually，they are far less powerful.

理性と非理性は相補的である。両者を分けると、力がぐっと小さくなります。

米ドラマ『カルタハウス』

2.His behaviour was becoming increasingly irrational .

彼の行為はますます理性的ではなくなってきた。

3.The weight of irrational guilt pressed on her.

いわれのない罪悪感に彼女は息切れした。

4.After taking the drug she became completely irrational .

彼女は麻薬を吸った後、完全に理性を失ってしまった。

5.Strong irrational dislikes of other people can easily be picked up from others.

他人に対する理不尽な嫌悪の気持ちは簡単に察知できる。