1. most characteristic of or resembling tweed fabric; most rough-textured or coarse
Usage: superlative form of tweedy
2. most stereotypically academic or professorial in appearance or manner
Usage: informal; superlative form of tweedy

Examples

• His jacket was the tweediest one in the entire clothing store.
• The fabric felt rough and had the tweediest texture I’d ever encountered.
• Professor Smith was the tweediest member of the English department.
• She chose the tweediest outfit for the academic conference.
• The old professor’s tweediest coat had patches on the elbows.
• Among all the blazers, this one has the tweediest appearance.