Definition of flightless adjective from the Oxford Advanced Learner's Dictionary

 

flightless

 adjective
adjective
BrE BrE//ˈflaɪtləs//
 
; NAmE NAmE//ˈflaɪtləs//
 
[usually before noun]
 
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(of birds or insects) unable to fly
See the Oxford Advanced American Dictionary entry: flightless