1. most smelling of dampness or decay; most musty
Usage: superlative form of fusty
2. most old-fashioned or outdated in thinking or approach
Usage: superlative form of fusty

Examples

• The basement was the fustiest room in the entire house.
• That old trunk had the fustiest smell after years in storage.
• His ideas about technology were the fustiest among all the professors.
• The library’s oldest section was also its fustiest corner.
• She found the fustiest books hidden away in the attic.
• The committee’s fustiest member opposed every new proposal.