- 1(literary) sully something to spoil or reduce the value of something By cheating they have sullied the good name of their country.
- 2sully something to make something dirty She wondered if she dared risk sullying the gleaming sink.
NAmE//ˈsʌli//(formal or )Verb Forms present simple I / you / we / they sully
he / she / it sullies
past simple sullied
-ing form sullying