Etymology
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mossy (adj.)

early 15c., "like moss, downy, velvety, or hairy;" 1560s, "overgrown with moss," from moss + -y (2).

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Definitions of mossy

mossy (adj.)
(used pejoratively) out of fashion; old fashioned;
Synonyms: fogyish / moss-grown / stick-in-the-mud / stodgy
mossy (adj.)
overgrown with moss;
Synonyms: moss-grown
From wordnet.princeton.edu