Breadcrumb Home > 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: centrifugal Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language