nasty
nas-ty
adjective
Causing serious harm, injury, or difficulty; severe or dangerous.
"She had a nasty fall and broke her arm."
adjective
Very unpleasant, offensive, or disagreeable to the senses or feelings.
"There's a nasty smell from the drains."
Thesaurus
Synonyms: foul, dirty, filthy, smutty, cruddy, mean, grotty, hateful, lousy, awful, hard, difficult
Antonyms: nice