1. unable to fly; lacking the ability or capacity to fly
Usage: commonly used to describe birds or insects that cannot fly

Examples

• Penguins are flyless birds that have adapted to life in the ocean.
• The flyless insect crawled along the ground instead of taking to the air.
• Some species of beetles are flyless due to their heavy exoskeletons.
• The flyless chicken could only move about the farmyard on foot.
• Scientists studied the flyless population of birds on the isolated island.