flightless

As adjectives the difference between flightless and flyless

is that flightless is unable to fly. Usually used with birds such as the penguin, ostrich, and emu while flyless is without flies (the insect).

As adjectives the difference between flightless and frightless

is that flightless is unable to fly. Usually used with birds such as the penguin, ostrich, and emu while frightless is free from fright; fearless.

As adjectives the difference between flightless and lightless

is that flightless is unable to fly usually used with birds such as the penguin, ostrich, and emu while lightless is lacking light; unilluminated.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective flightless is

unable to fly usually used with birds such as the penguin, ostrich, and emu.

As an adjective flightless

is unable to fly usually used with birds such as the penguin, ostrich, and emu.

As a noun weka is

the woodhen, a flightless bird of new zealand.

As adjectives the difference between flightless and unflighted

is that flightless is unable to fly usually used with birds such as the penguin, ostrich, and emu while unflighted is (of birds|rare) lacking flight feathers, typically due to immaturity (compare flightless).

As an adjective flightless

is unable to fly usually used with birds such as the penguin, ostrich, and emu.

As a noun flightlessness is

the condition of being flightless.