The Oxford Thesaurus An A-Z Dictionary of Synonyms - sneer v.

1) smirk, curl one's lip, sniff: Don't sneer - you might be the next to lose your job. 2) scorn, disdain, despise, contemn, turn up one's nose (at) , sniff (at) , jeer (at) , laugh (at) , deride, mock, ridicule; underrate; Colloq sneeze at, Slang knock: They sneered at her ambition to become a serious athlete. --n. 3) scorn, jeer, disdain, contempt, derision, mockery, ridicule; sneering, jeering: Barry endured his classmates' sneers without a word.