変質者（へんしつしゃ、henshitsusha）
- pervert

The Japanese word 変質者 (へんしつしゃ) refers to a "pervert," "sexual offender," or "deviant." It specifically describes someone who exhibits abnormal or antisocial sexual behavior. This includes, but isn't limited to, acts such as indecent exposure, voyeurism, exhibitionism, sexual harassment, and sexual assault. The core concept behind 変質者 is someone whose sexual conduct deviates from societal norms and often causes discomfort, fear, or harm to others. It is a derogatory and serious term.

⚫︎ あの男は変質者かもしれない。 Translation: That man might be a pervert. ⚫︎ 変質者が出没するという噂がある。 Translation: There is a rumor that a pervert has been appearing. ⚫︎ 警察は変質者による犯行の可能性を調べている。 Translation: The police are investigating the possibility of a crime committed by a sexual offender.

This word is used to describe someone suspected of or known to engage in sexually deviant behavior. It's a harsh term and should be used with caution, as it carries a strong negative connotation. You would use it when discussing a specific individual's actions or when warning others about potential dangers. Avoid using it casually or without sufficient evidence of inappropriate sexual behavior.

変質者 is typically written in kanji and read as へんしつしゃ in hiragana. It is rarely written in katakana. There are no significant variations in okurigana. It is always written as 変質者.

⚫︎ 痴漢 (ちかん) - molester (specifically on public transportation) ⚫︎ 性犯罪者 (せいさんはんざいしゃ) - sex offender ⚫︎ スケベ (スケベ) - lecher, pervert (more colloquial and less serious than 変質者) ⚫︎ 性犯罪者 (せい　はんざいしゃ) - sex offender ⚫︎ わいせつ犯 (わいせつはん) - obscene offender

There aren't direct antonyms, but words describing someone who behaves appropriately would be the opposite. Some possibilities include: ⚫︎ 善良な人 (ぜんりょうなひと) - a good person. ⚫︎ まじめな人 (まじめなひと) - an honest/sincere person.

駅で変質者に遭遇した女性は、警察に通報した。 ・Translation: The woman who encountered a pervert at the station reported it to the police. ・Explanation: This sentence describes a situation where a person, specifically a woman, experienced a negative encounter with an individual classified as 変質者.

公園に変質者が出没するという注意喚起がされた。 ・Translation: A warning was issued that a pervert was appearing in the park. ・Explanation: This example explains the distribution of a warning to be cautious of the appearance of a 変質者 in a public space.

The word is composed of two parts: 変質 (へんしつ) meaning "transformation," "alteration," or "change of nature/character" and 者 (しゃ) meaning "person" or "one who." Therefore, 変質者 literally means "a person whose nature or character has changed" or "a person of altered character," and in this context, it refers to a person whose sexual behavior is considered altered or deviant from societal norms. The word evolved to describe individuals exhibiting such behaviors.