Added 9 October 2026 flightless adjective Categories: Describing WordsRare Words adjective ! Definition from WordNet 3.1, Princeton University. More about flightless at Wordnik → Where our words come from → Incapable of flying. Related Words: winglesscormorantcormorantsimpennatepinfeatheredornithopodousapteralplumipedperipterousgymnopaedicplumigerousprotofeathered Back to today's word