0 not kind -- desagradable
She’s always being nasty to her little brother.
1 very bad -- grave, con mala pinta
3 very unkind -- ruin [ masculine-feminine, singular ]
nasty remarks comentarios ruines
4 unpleasant or disgusting -- desagradable [ masculine-feminine, singular ]
5 serious or damaging -- desagradable [ masculine-feminine, singular ]
a nasty accident un accidente desagradable