sterile(CLEAN)
Unsterile tattooing equipment can transmit serious diseases, including tetanus, hepatitis B, and HIV.
Because methadone is taken orally, it also reduces the risk of infection caused by using unsterile needles.
Surgical instruments must be replaced or re-sterilized if they are handled in an unsterile manner or are allowed to touch an unsterile surface.
Take care not to contaminate the jam jars with utensils or any other unsterile object.

SMART Vocabulary: related words and phrases

Dirty & untidy
all over the placeidiom
Augean
besmeared
bespattered
bloodied
look like something the cat brought/dragged inidiom
look like/as if you've been dragged through a hedge backwardsidiom
manky
messily
messy
slovenly
sluttish
sluttishly
soiled
sordid
unsterilized
untidily
untidy
untrimmed
unwashed