白痴|はくちhakuchi[0]heiban (flat)

1. nounidiot; idiocy
2. noun, medicineprofound mental retardation

• SynonymアホCasualColloquial insult, especially in Kansai; often affectionate or teasing between friends. Unlike 「白痴」, it is not a discriminatory old medical term.
• SynonymばかNeutralThe most common everyday insult; also covers foolish, absurd or trivial things. Far broader in use than 「白痴」, which is a dated medical label.
• Synonym間抜けまぬけCasualColloquial; mocks someone for blundering or failing at the crucial point. Carries a mocking tone and no implication of intellectual disability.
• Synonym馬鹿者ばかものNeutralOften used in face-to-face scolding, as in 「この馬鹿者！」; heavier than 「馬鹿」. Unlike 「白痴」, it is not a discriminatory old medical term.
• SynonymとんまCasualColloquial; suggests a silly, slow-witted person with a comic flavor. A milder jab than 「白痴」.
• SynonymトンチキCasualColloquial; for someone laughably foolish, often hurled as a direct insult. Carries none of 「白痴」's medical overtones.
• Synonym愚人ぐじんWrittenWritten and rather literary; a general term for an unintelligent person, found in maxims and prose. In speech you would say 「馬鹿」.
• Synonym痴人ちじんWrittenWritten style for a foolish person, and fairly rare. 「白痴」 itself began as a medical term and is now seen as discriminatory.
• Synonym低能ていのうWrittenWritten; stresses low intelligence and is highly offensive when used as an insult. Like 「白痴」, a term best avoided.
• Synonym低能者ていのうしゃWrittenWritten; a person of low intelligence. Strongly offensive and discriminatory — a term to avoid, not for everyday use.
• SynonymばかやろうCasualColloquial; a crude, angry insult often shouted on its own, as in 「馬鹿野郎！」. Just as rude, but without 「白痴」's medical sense.
• Synonym痴愚ちぐWrittenWritten; an old grading term for intellectual disability — moderate, where 「白痴」 meant severe. Also folly in a general sense.
• Synonym愚者ぐしゃWrittenWritten; a general word for a foolish person, seen in maxims and literature, and the name of the Tarot Fool. No medical sense.
• Synonym痴れ者しれものCasualOld-fashioned word for a fool, also a rough, violent type; mostly in period dramas and novels, rarely in daily speech.
• RelatedのろまCasualColloquial; stresses sluggish movements and lack of wit, often aimed at someone slow at a task. No medical sense.
• Related鈍どんWrittenWritten; stresses slow reactions or comprehension, as in 「鈍な奴」, and also describes a dull blade. Far milder than 「白痴」.
• RelatedうすのろCasualColloquial; for someone slow-witted and slow to catch on, with strong contempt. No medical sense attached.
• RelatedたわけCasualOld-fashioned insult that also covers tomfoolery and absurd antics; common in period dramas. Today you would say 「馬鹿」.
• RelatedうすばかCasualColloquial; someone a bit dim or not quite sharp, with a contemptuous edge. Lacks the medical sense of 「白痴」.
• Relatedたわけ者たわけものCasualOld-fashioned insult for a fool, heard in period dramas, as in 「このたわけ者め」; rare in modern speech.
• Relatedうつけ者うつけものCasualOld-fashioned; a fool who cannot tell reason from folly — the young Oda Nobunaga was famously called 「大うつけ」.
• RelatedぼんくらCasualColloquial; suggests someone vague and unable to see through anything, often aimed at a useless person. No link to intellectual disability.
• Antonym天才てんさいNeutralA person with extraordinary natural talent — the opposite extreme from 「白痴」, which implies extremely low intelligence.
• Antonym賢者けんじゃWrittenWritten; a wise, sagely person, the opposite of 「白痴」 on the scale from clever to foolish.

「白痴」 was once a medical term for severe intellectual disability and now reads as discriminatory, surviving mostly in literature such as Dostoevsky's novel. For everyday insults 「馬鹿」 is the default, with 「アホ」 adding a Kansai, teasing flavor — both still impolite. Scold someone face to face with 「馬鹿者」 or the rougher 「馬鹿野郎」. The old-fashioned 「たわけ者」, 「痴れ者」 and 「うつけ者」 belong to period dramas. Literary 「愚者」 and 「愚人」 suit prose; disability-related 「低能」 and 「痴愚」 are dated and best avoided.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 重度じゅうどの精神せいしん薄弱はくじゃく。
2. ドストエフスキーの長編ちょうへん小説しょうせつ。
3. 坂口さかぐち安吾あんごの短編小説たんぺんしょうせつ。