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• n  the quality of smelling or tasting old or stale or mouldy

• The venerable institution has thrown off its quaint mustiness and become one of Europe's most inviting cultural attractions.
• Gradually, with the passage of years, its mustiness changes to a delicate old-fashioned odor.
• Matisse did much, at the beginning of this century, to dispel the mustiness of academic art.

• must
• moldiness