dumb bunny . dumb bunny {n.}, {slang}, {informal} Any person who is gullible and stupid. Jack is a regular dumb bunny. Categories: add yours {informal} {n.} {slang} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 » In RussianTo section: D Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Post my comment