/ Dictionary / Index I imperil: Meaning and Definition of Find definitions for: im•per•il Pronunciation: (im-per'ul), [key] — -iled, -il•ing -illed, -il•ling. to put in peril or danger; endanger. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: imperil (Thesaurus) Imperial Valley imperious Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language