Nasty (2) /ˈnæsti/ (unkind) Behaving in a mean or unkind way. Example sentences: He made a nasty comment about her appearance. The boss was in a nasty mood and yelled at everyone. She gave him a nasty look before walking away. The kids were nasty to each other during the argument. He sent a nasty email to complain about the service. Common usage tip(s): "Nasty" can describe unkind words, actions, or looks. It often conveys a strong negative emotion, such as anger or spite.