Synonyms for Flightless:

n.

lesser, common, webbed, crested, great, fledged, migratory, gregarious, full-fledged. flightless (noun)
wingless.

Other synonyms:

crested, webbed, gregarious, fledged, migratory. full-fledged. lesser. common. great. Other relevant words:
lesser, common, webbed, crested, great, fledged, migratory, gregarious, full-fledged.