moldy /ˈmoʊldi/adjective 6noun 1forms 4 adjective6 •Covered with mold. •Covered with mould. •Stale or musty. •(UK, informal) Worthless; lousy; rotten.'Go cuddle up to your mouldy old papers,' she shouted at him. 'See how warm they'll keep you.' She slammed the door and made to walk off. — 2014 •(figurative) Showing signs of neglect; disused. •(offensive, no longer used) Gray-headed, whether from age or hair powder. noun1 •(slang, old-fashioned) A torpedo. formsmoldier · more moldy · moldiest · most moldy