incapable of flying: flightless birds such as the moa, rhea, and dodo.

1870–75; flight1 + -less

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World English Dictionary
flightless (ˈflaɪtlɪs)
See also ratite (of certain birds and insects) unable to fly

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Everywhere were flightless chicks, some scurrying to hide in hollows, others
  heading for the sea.
Don't forget to snap a few shots of the flightless resident ravens hopping
  around the grounds.
Consider the flightless fluffs of brown otherwise known as herring gull chicks.
Any of the birds of the period that were big enough to even consider attacking
  one were flightless.
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