潔癖（けっぺき、keっpeki）
- fastidious

The Japanese word 潔癖 (けっぺき, *keppeki*) describes the state of being extremely clean, fastidious, or having a strong aversion to dirt, germs, or disorder. It can refer to both physical cleanliness and a moral or ethical sense of purity. The concept often extends beyond just cleanliness; it can encompass a strong adherence to rules, principles, and a dislike for anything perceived as "dirty" or "impure." It is similar to the English concept of being "a clean freak," or having "obsessive cleanliness". 潔癖 is often used to describe someone who is very particular about their environment and the cleanliness around them. It is important to note the nuance; while 潔癖 can describe positive qualities like diligence and being organized, it can also have negative connotations, implying an excessive and potentially unhealthy focus on cleanliness.

⚫︎彼は潔癖］で、少しでもホコリがあると掃除を始めます。 Translation: He is a clean freak and starts cleaning at the slightest speck of dust. ⚫︎あの人は潔癖］だから、汚い場所には絶対に行きたがらない。 Translation: That person is very particular about cleanliness, so they never want to go to dirty places.

You can use 潔癖 to describe someone's personality, behavior, or even their living environment. It is used more often to describe a person’s tendency or character, not a temporary situation. When describing a person, you can use it directly, like 潔癖］な人 (*keppeki na hito*, a person with 潔癖). You can also use it to describe their actions, such as 潔癖］な性格 (*keppeki na seikaku*, a 潔癖 personality). Be mindful of the potential negative connotations; use it carefully. The word is generally considered more formal than casual.

潔癖 is primarily written using kanji and read as けっぺき (*keppeki*) in hiragana. There are no other standard ways to write this word, and the okurigana (suffix hiragana) is always け.

⚫︎ 綺麗好き (*kireizuki*) - Loves cleanliness; fond of being clean. ⚫︎ 清潔好き (*seiketsuzuki*) - Loves cleanliness. ⚫︎ 几帳面 (*kichoumen*) - Meticulous, precise, and organized. ⚫︎ 神経質 (*shinkeishitsu*) - Nervous, sensitive, or easily worried (can overlap with 潔癖).

⚫︎ 不潔 (*fuketsu*) - Unclean, unsanitary. ⚫︎ 不衛生 (*fuseiei*) - Unhygienic. ⚫︎ だらしない (*darashinai*) - Sloppy, untidy. ⚫︎ いい加減 (*iikagen*) - Casual, lax, or careless.

彼は潔癖］症で、公共のトイレを使うのを嫌がります。 ・Translation: He has a compulsion for cleanliness and dislikes using public restrooms. ・Explanation: This sentence illustrates a more extreme case of 潔癖, suggesting a phobia or a strong aversion related to cleanliness.

彼女は潔癖］で、食べ物を落としたら、たとえ一瞬でも食べません。 ・Translation: She is very particular, and if she drops food, she won't eat it, even if it's just for a moment. ・Explanation: This sentence demonstrates the detail-oriented aspect of 潔癖, focusing on a specific action that shows a strong concern for cleanliness.

The word 潔癖 is derived from the kanji 潔 (*ketsu*), meaning "clean" or "pure," and 癖 (*heki*), meaning "habit" or "inclination." Therefore, the literal translation suggests "a habit or inclination towards cleanliness."