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.

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

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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
diligent (ˈdɪlɪdʒənt)
1.  careful and persevering in carrying out tasks or duties
2.  carried out with care and perseverance: diligent work
[C14: from Old French, from Latin dīligere to value, from dis- apart + legere to read]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-14c., from Fr. diligent (13c.), from L. diligentem "attentive, assiduous," originally prp. of diligere (see diligence). Related: Diligently.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Working out a rough estimate of the mileage you've covered isn't difficult if
  you're diligent about it.
They are a diligent and industrious race, eager to gain, and tenacious of their
He stands diligently at train stops, shaking hands.
More than a study of interlinked lives, the novel is a diligent,
  atmospherically detailed slice of social and cultural history.
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