1. having no flaps or lacking flaps
Usage: commonly used in aviation and clothing contexts
2. of an aircraft: designed or modified to operate without wing flaps
Usage: technical, aviation

Examples

• The flapless design of the pocket made it less functional for storage.
• Early aircraft were flapless by necessity, relying on other control surfaces.
• She preferred flapless envelopes for a cleaner appearance.
• The flapless wings of the experimental plane required different landing procedures.
• Modern backpacks often feature flapless closures with zippers instead.