Noun Definitionsneak1.Definition: a person who is regarded as underhanded and furtive and contemptibleCategory: People2.Definition: someone acting as an informer or decoy for the policeRelated Noun(s):canary, fink, sneaker, snitch, snitcher, stool pigeon, stoolie, stoolpigeonCategory: People3.Definition: someone who prowls or sneaks about; usually with unlawful intentionsRelated Noun(s):prowler, stalkerCategory: People