/ Dictionary / Index N NSF: Meaning and Definition of Find definitions for: NSF Pronunciation: [key] See not sufficient funds. N/S/F Pronunciation: [key] not sufficient funds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nsf (Thesaurus) NSC N-shell Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language