flightless

The penguin is a flightless bird.

企鹅是一飞的鸟。

Hesperornis is an extinct genus of flightless aquatic birds that lived during the Late Cretaceous.

黄昏鸟是一已经灭绝的飞翔的水鸟，生活在白垩纪晚期。

In some species, such as aphids, the flightless morph lacks wings and is called the apterous morph.

一些昆虫类，如蚜虫，出现无个体，被称为无型。