"sneering" in the verb sense
1. sneer
express through a scornful smile
"she sneered her contempt"
2. sneer
smile contemptuously
"she sneered at her little sister's efforts to play the song on the piano"
"sneering" in the adjective sense
1. supercilious, sneering, snide
expressive of contempt
"curled his lip in a supercilious smile"
"spoke in a sneering jeering manner"
"makes many a sharp comparison but never a mean or snide one"
Source: WordNet® (An amazing lexical database of English)
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