/ Dictionary / Index F flightless: Meaning and Definition of Find definitions for: flight•less Pronunciation: (flīt'lis), [key] — adj. incapable of flying: flightless birds such as the moa, rhea, and dodo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: flightless (Thesaurus) flight leader flight line Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language