Something nasty.
"The smell coming from the trash can was truly something nasty."
Dirty, filthy.
"The old sofa had such a nasty smell that it looked like someone left food crumbs in the cushions for weeks."
A hamlet in Great Munden parish, East Hertfordshire district, Hertfordshire, England (OS grid ref TL3524).
"The village of Nasty is a small settlement located within the parish of Great Munden."
The word nasty comes from Middle English and originally meant "unclean" or "filthy." It likely traveled into modern usage through North Germanic languages like Danish and Swedish before entering the English language.