flat tire

noun

1. a pneumatic tire that has lost all or most of its air through leakage, puncture, or the like.

2. Older Slang.,  a dull or socially inept person.

Word History and Origins

Origin of flat tire¹

First recorded in 1920–25

Related Words

• boring 
• innocuous 
• insipid 
• stale 
• tedious 
• uninspiring