不衛生|ふえいせいfueisei[2]nakadaka (mid-high)

1. na-adjective, noununsanitary condition; lack of hygienic care; inattention to hygiene; unhygienic conditions

• Synonym不潔ふけつNeutralFocuses on the state of being dirty or unclean, and can also mean immoral; 「不衛生」 stresses conditions that harm health.
• Synonym汚いきたないNeutralThe most common everyday word for dirty, with the broadest range: appearance, dirty tactics, sloppy handwriting.
• Related薄汚いうすぎたないCasualColloquial word for something that looks a bit dirty or dingy; it is about the visual impression it gives.
• Related汚らわしいけがらわしいWrittenWritten/formal word for dirtiness that inspires disgust, often carrying a sense of moral filth.
• Related汚らしいきたならしいNeutralDescribes something that looks very dirty and unpleasant; a matter of appearance, not necessarily a health risk.
• Relatedむさ苦しいむさくるしいCasualColloquial word for a messy, unkempt room or scruffy, slovenly clothing; often used self-deprecatingly.
• Related醜穢しゅうわいWrittenWritten term for what is both ugly and filthy; very rare and carrying a strong sense of disgust.
• Antonym清潔せいけつNeutralAntonym: clean and hygienic, as in 「清潔なタオル」; the direct opposite of unsanitary.
• Antonym衛生的えいせいてきNeutralAntonym: hygienic, i.e. good for preventing illness and staying healthy; the opposite of 「不衛生」's poor sanitary conditions.

Everyday 'dirty' is 「汚い」 or 「不潔」; keep 「不衛生」 for conditions that threaten health and use 「むさ苦しい」 for a messy room. 「薄汚い」 and 「汚らしい」 are about a dirty appearance, while written 「汚らわしい」 and rare 「醜穢」 add moral disgust. Antonyms: 「清潔」 and 「衛生的」.

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

1. 衛生的えいせいてきでないこと。また、そのような様子ようす。