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Synonyms for Mossy (same or very similar meaning)

WordNet sense 1 (overgrown with moss):
moss-grown

WordNet sense 2 (overlaid or spread or topped with or enclosed within something; sometimes used as a combining form):
covered

WordNet sense 3 ((used pejoratively) out of fashion; old fashioned):
fogyish, stick-in-the-mud, stodgy

WordNet sense 4 (not in accord with or not following current fashion):
unfashionable, unstylish


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