insanity
🇺🇸
/ɪnˈsænəti/
🇬🇧
/ɪnˈsænəti/
a serious mental illness that makes someone unable to think or behave normally
The court decided he was not responsible for his actions due to insanity.
裁判所は、彼が精神疾患のために自分の行動に責任がないと判断した。
very foolish or dangerous behavior
Continuing to invest in that failing company is pure insanity.
その倒産しそうな会社に投資を続けることは全くの愚行だ。