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[dil-i-juh nt] /ˈdɪl ɪ dʒənt/
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.
Origin of diligent
1300-50; Middle English (< Anglo-French) < Latin dīligent- (stem of dīligēns), present participle of dīligere to choose, like, equivalent to dī- di-2 + -ligere (combining form of legere to choose, read); see -ent
Related forms
diligently, adverb
diligentness, noun
nondiligent, adjective
nondiligently, adverb
overdiligent, adjective
overdiligently, adverb
overdiligentness, noun
prediligent, adjective
prediligently, adverb
undiligent, adjective
undiligently, adverb
1. industrious, assiduous, sedulous. See busy. 2. indefatigable, untiring, tireless, unremitting. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for diligent
Contemporary Examples
Historical Examples
  • He enhanced the endowment by diligent study in the high school at Prato, in Tuscany, where he spent his boyhood.

    Idling in Italy Joseph Collins
  • She was "diligent in business," but this did not preclude her being "fervent in spirit."

  • She had enjoyed good health nearly all that time and had been diligent in season and out of season in the Master's business.

    South and South Central Africa H. Frances Davidson
  • Of what is know as Elizabethean literature he has been a diligent student.

  • Be diligent on your own side of this great business, and God will not withhold his power.

    The Parables of Our Lord William Arnot
British Dictionary definitions for diligent


careful and persevering in carrying out tasks or duties
carried out with care and perseverance: diligent work
Derived Forms
diligently, adverb
Word Origin
C14: from Old French, from Latin dīligere to value, from dis- apart + legere to read
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for diligent

mid-14c., from Old French diligent (14c.), from Latin diligentem "attentive, assiduous" (see diligence). Related: Diligently.

Online Etymology Dictionary, © 2010 Douglas Harper
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