Not promoting cleanliness or health; opposed to good hygiene practices.
From anti- (against) + hygienic (relating to health and cleanliness). Hygienic derives from Hygeia, the Greek goddess of health. The term became common in the late 1800s as germ theory made hygiene a scientific concern.
Interestingly, people once thought fresh air was 'antihygienic' because they feared it carried diseases—but it was actually the opposite, as poor ventilation spread germs in crowded spaces.
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