/ Dictionary / Index F fallacious: Meaning and Definition of Find definitions for: fal•la•cious Pronunciation: (fu-lā'shus), [key] — adj. containing a fallacy; logically unsound: fallacious arguments. deceptive; misleading: fallacious testimony. disappointing; delusive: a fallacious peace. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fallacious (Thesaurus) fal la fallacy Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language