The definition of smarmy is someone who comes across as being insincere.(adjective)
An example of someone who is smarmy is a used car salesman who tries to come across as if he is a distinguished businessman making you a fair deal but who sounds like he is lying.
See smarmy in Webster's New World College Dictionary
See smarmy in American Heritage Dictionary 4
adjective smarm·i·er, smarm·i·est
Origin: From smarm, to smear.
Learn more about smarmy