1. Plural of fastback; automobiles with a roof that slopes continuously from the windshield to the rear of the vehicle without a distinct trunk.
Usage: automotive; common in car design and enthusiast contexts

Examples

• The 1960s muscle cars included many fastbacks with sleek, aerodynamic designs.
• Modern fastbacks offer a sporty appearance combined with practical cargo space.
• Collectors prize vintage fastbacks for their distinctive silhouettes.
• The dealership displayed several fastbacks on the showroom floor.
• Fastbacks became popular during the era of high-performance American automobiles.