Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Marked by persevering, painstaking effort. See Synonyms at busy.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Performing with intense concentration, focus, responsible regard.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Prosecuted with careful attention and effort; careful; painstaking; not careless or negligent.
  • adj. Interestedly and perseveringly attentive; steady and earnest in application to a subject or pursuit; assiduous; industrious.

from The Century Dictionary and Cyclopedia

  • Constant in study or effort to accomplish what is undertaken; attentive and persistent in doing anything; industrious; assiduous.
  • Steadily applied; prosecuted with care and constant effort; careful; painstaking: as, make diligent search.
  • Synonyms Active, sedulous, laborious, persevering, indefatigable, unremitting, untiring, painstaking.
  • Diligently.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. quietly and steadily persevering especially in detail or exactness
  • adj. characterized by care and perseverance in carrying out tasks

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English, from Old French, from Latin dīligēns, dīligent-, present participle of dīligere, to esteem, love : dī-, dis-, apart; see dis- + legere, to choose; see leg- in Indo-European roots.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English diligent, from Old French diligent, from Latin diligens ("careful, attentive, diligent"), present participle of diligere ("to love, esteem much, literally to choose, select"), from di-, dis- ("apart") + legere ("to choose"); see elect and select.

Examples

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