idiot; idiocy
Sensitive and potentially offensive term for a foolish person or stupidity. Use with caution; often replaced by milder words in polite conversation.
He's such an idiot for doing something like that.
That remark is the height of idiocy.
profound mental retardation
Dated medical term for severe intellectual disability; now considered offensive and replaced by terms like 重度知的障害.
In old medical texts, '白痴' was used as a term for profound mental retardation.
It's too cruel to call him an idiot with words like that.
He pretended to be an idiot to avoid danger.