"Tell us when you plan to visit us next time," one of the guards said snidely.
Haley: Your detractors in the Negro community often refer to you snidely as “De Lawd” and “Booker T. King.”
One has to think about what one is really saying when one snidely dismisses women who are interested in fashion.
1859, thieves' slang, "counterfeit, sham, bad, spurious," of unknown origin. Of persons, "cunning, sharp," from 1883. Sense of "sneering" is first attested 1933, perhaps via sense of "hypocrisy, malicious gossip" (1902). Related: Sneeringly.