1. tending to flap; moving loosely or with repeated fluttering motions
Usage: informal

Examples

• The flappy tent door kept banging in the wind.
• She wore a flappy shirt that moved with every breeze.
• The bird's flappy wings made a loud noise as it took off.
• His flappy tie was distracting during the presentation.
• The flappy sail caught the wind and propelled the boat forward.