1. a stale, musty, or stuffy smell or quality, as in an old or poorly ventilated place
2. the quality of being old-fashioned, outdated, or excessively formal in style or manner

Examples

• The fustiness of the attic made it unpleasant to spend much time there.
• She complained about the fustiness of the old library, which hadn't been properly aired in years.
• His fustiness in dress and manner made him seem out of touch with contemporary culture.
• The fustiness of the Victorian mansion's interior reflected its lack of modern updates.
• Despite the fustiness of the rules, the club maintained its traditional ceremonies.
• Opening the windows helped dispel the fustiness that had accumulated in the closed room.