Translation guide
The concept of 'imbecility' refers to extreme foolishness, stupidity, or mental weakness. In Japanese, this can be expressed through nouns, adjectives, and idiomatic phrases that convey a lack of intelligence or poor judgment. The most common and natural ways to express this idea range from direct terms for 'stupidity' to more nuanced expressions describing foolish behavior or mental deficiency.
Expressing that someone or something is extremely stupid, foolish, or lacking in intelligence.
A standard noun meaning 'foolishness' or 'stupidity'. It is neutral in tone and can be used in both spoken and written contexts.
彼の愚かさには驚かされる。
I am amazed at his stupidity.
A colloquial noun derived from '馬鹿' (fool). It is more casual and direct, often used in spoken Japanese.
そんな馬鹿さは許せない。
I can't forgive such stupidity.
A formal or literary term meaning 'stupidity' or 'dullness'. It implies a slow-witted or dim nature.
彼の愚鈍さが問題を引き起こした。
His dullness caused the problem.
Referring to a specific action or behavior that is imbecilic or extremely foolish.
A noun meaning 'foolish act' or 'folly'. It is commonly used in both spoken and written Japanese to describe a stupid action.
それは全くの愚行だった。
That was sheer folly.
A phrase meaning 'ridiculous act' or 'foolish behavior'. '馬鹿げた' is an adjective meaning 'absurd' or 'stupid'.
彼の馬鹿げた行為に皆が呆れた。
Everyone was disgusted by his foolish behavior.
A formal term for a 'foolish undertaking' or 'reckless act'. Often used in written or serious contexts.
その計画は愚挙に等しい。
That plan amounts to a foolish undertaking.
Referring to a state of mental weakness or low intelligence, often in a clinical or derogatory sense.
The modern, neutral term for 'intellectual disability'. It is the appropriate term in medical and social contexts.
彼は知的障害がある。
He has an intellectual disability.
A rare, literary term meaning 'imbecility' or 'feeble-mindedness'. It is very formal and almost never used in modern conversation.
彼は生まれつき魯鈍であった。
He was born with imbecility.
Expressing that something is so foolish it is laughable or absurd.
A noun meaning 'absurdity' or 'ridiculousness'. It conveys a sense of something being so stupid it's not worth taking seriously.
その提案の馬鹿らしさに笑ってしまった。
I laughed at the absurdity of the suggestion.
A more formal term for 'foolishness' or 'absurdity', often implying moral or intellectual inferiority.
彼の行動の愚劣さには言葉もない。
I am speechless at the foolishness of his actions.
In modern Japanese, clinical terms like 'imbecility' are not used. Use '知的障害' (intellectual disability) for neutral, respectful communication. Older terms like '精神薄弱' are considered derogatory and should be avoided unless discussing historical usage.
'愚かさ' is more formal and can be used in writing or serious speech. '馬鹿さ' is casual and often used in everyday conversation. Choose based on the context and level of politeness required.
An older term for 'mental retardation' or 'feeble-mindedness'. It is now considered outdated and potentially offensive, but may still appear in historical contexts.
精神薄弱という言葉は現在では使われない。
The term 'mental retardation' is no longer used today.