/ Dictionary / Index D diligent: Meaning and Definition of Find definitions for: dil•i•gent Pronunciation: (dil'i-junt), [key] — adj. constant in effort to accomplish something; attentive and persistent in doing anything: a diligent student. done or pursued with persevering attention; painstaking: a diligent search of the files. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diligent (Thesaurus) diligence dill Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language