mouldy

adj

1. Covered with mould.
2. (figuratively)Showing signs of neglect; disused.
3. (UK, colloquial)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.”

4. (derogatory, obsolete, slang)Gray-headed, whether from age or hair powder.

   “Let him be great, as e'er he will, / He's rotten at the heart's core still; / Yet counsel from his mouldy pate, / Supports the trembling chair of state, / And scatters with unsparing hand, / A thousand miseries o'er the land; […]”

noun

1. (UK, dated, slang)A torpedo.

   “2021, Bennet Copplestone, The Silent Watchers: England's Navy during the Great War I knew something of gunnery once, but now I'm on the shelf. I myself would risk the mouldies and fight at close quarters—we have the legs of Fritz and could choose our own range—but in-fighting means tremendous risks, and the dear stupid old public would howl for my head if the corresponding losses followed.”