What is the meaning of Flightless?

Unable to fly.

  1. Describing kinds of birds that normally cannot fly, such as the penguin, ostrich, and emu.

    Describing kinds of birds that normally cannot fly, such as the penguin, ostrich, and emu.

    Describing an individual bird that normally would be able to fly but in this case cannot, such as an injured sparrow.

    Suddenly deprived of a scheduled (airline) flight by its cancellation.

    Source: wiktionary.org