Breadcrumb Home > Dictionary Cite Meaning of nonfeasance Find definitions for: non•fea•sance Pronunciation: (non-fē'zuns), [key] — n. Law. the omission of some act that ought to have been performed. Cf.(def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nonfeasance (Thesaurus) Related Content Daily Word Quiz: polemic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language