The definition of wicked is someone or something who is cruel or acts in an evil way. An example of wicked is the way you would describe a witch. You must never think of such a wicked thing again. You are wicked, going such a long way all alone! [adjective] - INFORMAL- excellent they are wicked people wicked deed
When he was asked to leave he got nasty When he was asked to leave he got nasty. e.g. He had a nasty experience at the dentist when he was young, and the memories of this put him off dental surgeries for life. ha has a nasty temper these boys have played a very nasty trick.