unsanitary; unhygienic
Describes conditions, practices, or environments that are not clean or healthy. Often used in formal or technical contexts. The synonym 不衛生 is more common in everyday speech.
See also: 不衛生
The kitchen of that restaurant was unsanitary.
Handling food in an unhygienic environment is dangerous.
Formed from the prefix 非- (non-) and 衛生 (hygiene/sanitation). The word 衛生 itself is a Meiji-era coinage from Chinese elements.