harum-scarum . harum-scarum (1) {adv.}, {informal} In a careless, disorderly or reckless way. Jim does his homework harum-scarum, and that is why his schoolwork is so poor. Categories: add yours {adv.} {informal} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: H Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Leave my opinion