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    Online English Dictionary

    Wordnet English Dictionary

    adj
    quietly and steadily persevering especially in detail or exactness; "a diligent (or patient) worker"; "with persevering (or patient) industry she revived the failing business"
    characterized by care and perseverance in carrying out tasks; "a diligent detective investigates all clues"; "a diligent search of the files"

    Wordnet English Thesaurus

    adj
    assiduous, industrious, hard working, conscientious, painstaking, busy, attentive, tireless, careful, meticulous, persevering, persistent, studious

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