Pronunciation (UK) enPR: thēf, IPA (key): /θiːf/ (US) IPA (key): /θif/ Audio (US)(file) Noun Singular thief Plural thieves (countable) A thief is a person who steals. Synonyms: bandit, robber and burglar Related words theft thieve Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads