nasty

[ˈnɑːstɪ]
1.
(colloq) noun (in food, water, air) saleté f
video nasty — film m d'épouvante en vidéo
2.
adjective
1) (unpleasant) [crime, experience, sight, taste, surprise, suspicion] horrible; [feeling, task] désagréable; [habit, weather, smell, taste] mauvais; [expression, look] méchant; [rumour] inquiétant; [stain] gros/grosse; [affair, business] sale (before n)
I got a nasty fright — j'ai vraiment eu un choc
things could get nasty — les choses pourraient mal tourner
to turn nasty — [person, dog] devenir méchant; [weather] se gâter
to be a nasty piece of work — (colloq) GB être un sale type (colloq)/une sale bonne femme (colloq)
2) (unkind) [person] désagréable; [trick] sale (before n), vilain; [gossip, remark, letter] méchant
you've got a nasty mind — tu vois toujours le mal partout
to be nasty to — être dur envers
3) (serious) [cut, bruise] vilain (before n); [bump, crack, fall, accident] grave; [cold] mauvais (before n)
4) (ugly) affreux/-euse
5) (tricky) [problem, question] difficile; [bend] dangereux/-euse