Meaning of nasty

(adj) offensive or even (of persons) malicious; "in a nasty mood"; "a nasty accident"; "a nasty shock"; "a nasty smell"; "a nasty trick to pull"; "Will he say nasty things at my funeral?"- Ezra Pound

exasperatingly difficult to handle or circumvent; "a nasty problem"; "a good man to have on your side in a tight situation"

characterized by obscenity; "had a filthy mouth"; "foul language"; "smutty jokes"

disgustingly dirty; filled or smeared with offensive matter; "as filthy as a pigsty"; "a foul pond"; "a nasty pigsty of a room"