/ Dictionary / Index I ill nature: Meaning and Definition of Find definitions for: ill' na'ture Pronunciation: [key] unkindly or unpleasant disposition. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ill-mannered ill-natured Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language