Meaning of “nasty” - Learner’s Dictionary

nasty

adjective uk us /ˈnɑːsti/
BAD

B1 very bad:

a nasty shock/surprise
a nasty smell/taste
a nasty cut/burn
UNKIND

B1 unkind:

She's always being nasty to her little brother.
ANGRY

B2 very angry or violent:

When I asked for the money, he turned really nasty.
nastiness noun [ U ]

(Definition of “nasty” from the Cambridge Learner’s Dictionary © Cambridge University Press)