fuddy-duddy fuddy-duddy {n.} A person whose ideas and habits are old-fashioned. His students think Professor Jones is an old fuddy-duddy. Categories: add yours {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 To section: F Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss