The material cannot be cleaned, and as a collector of dust is most unhygienic.
The time had been when she would at once have denounced the room as overcrowded and unhygienic.
Diphtheria is not directly caused by unhygienic surroundings.
You—you don't think it will be unhygienic for him to sleep with me?
It is not ideal if it is unethical, unhygienic, or unæsthetic.