SynonymDefinitionAntonym.com - English Synonym Dictionary

Someone acting as an informer or decoy for the police

Someone who prowls or sneaks about; usually with unlawful intentions

A person who is regarded as underhanded and furtive and contemptible

To go stealthily or furtively

Make off with belongings of others

Pass on stealthily

Put, bring, or take in a secretive or furtive manner

Marked by quiet and caution and secrecy; taking pains to avoid being observed