letter-perfect letter-perfect {adj. phr.} Memorized perfectly; perfect to the last letter. The actor was letter-perfect in his role. Categories: add yours {adj. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: L Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Add my comment