flightless

A flightless, juvenal female was obtained by local boys at Pisté on July 21.
Summer Birds From the Yucatan Peninsula|Erwin E. Klaas
The wekas or Maori hens are small, flightless birds, averaging when full grown about two and three-quarter pounds.
The Home of the Blizzard|Douglas Mawson
The Ratitae differ from Archaeopteryx and the great majority of Carinatae in being flightless.
The Vertebrate Skeleton|Sidney H. Reynolds
In several instances I have treated of extinct flightless species under genera including existing species capable of flight.
Extinct Birds|Walter Rothschild

This appears to have been a very large species, with not very great powers of flight, if not flightless.
Extinct Birds|Walter Rothschild

British Dictionary definitions for flightless

flightless

/ (ˈflaɪtlɪs) /

adjective

(of certain birds and insects) unable to flySee also ratite

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012