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flightless
This term describes a biological state of permanent incapacity rather than a temporary inability. It carries a clinical, zoological tone, typically used to categorize species that have undergone evolutionary adaptation, such as penguins or kiwis, where the loss of flight is a defining characteristic of their lineage.
While the word is primarily scientific, it can be used in a literal sense to describe any creature that cannot fly. It lacks the negative connotation of "disabled" because, in an evolutionary context, being flightless is often a specialized survival strategy rather than a deficiency.
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Penguins are flightless birds that are expert swimmers.
The ostrich is the largest flightless bird in the world.
Why are some birds flightless while others can soar for miles?
The kiwi is a small flightless bird endemic to New Zealand.
It is fascinating how these creatures became flightless over millions of years.
It is fascinating how these creatures became flightless over millions of years.
The dodo was a flightless bird that eventually went extinct.
The dodo was a flightless bird that eventually went extinct.
Look at that flightless bird waddling across the ice.
Most flightless birds evolved in environments with few natural predators.