Anything covered with or resembling moss is mossy. A mossy rock can be pretty. Mossy teeth are never pretty.

Moss tends to grow in a green carpet, especially in wooded or shady areas, so when you're walking through a forest you'll probably come upon mossy areas. Informally, you can also use this adjective to mean "old fashioned" or "dated." Your grandparents' conservative ideas about dating, for example, might be a little mossy. The word stems from an Old English root, meos, that's a close relation to mos, or "bog."

Definitions of mossy

adj overgrown with moss

overlaid or spread or topped with or enclosed within something; sometimes used as a combining form

adj (used pejoratively) out of fashion; old fashioned

fogyish, moss-grown, stick-in-the-mud, stodgy
unfashionable, unstylish
not in accord with or not following current fashion

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