nastily
🇺🇸
/ˈnæstɪli/
🇬🇧
/ˈnɑːstɪli/
in a way that is mean or not nice
‘I hate you,’ she said nastily, with a scowl on her face.
in a way that is very bad or harmful
He fell and his ankle was nastily twisted, causing him a lot of pain.