Someone who is diligent works hard and carefully. If you want to write the epic history of your family, you'll have to be very diligent in tracking down and interviewing all of your relatives.

Diligent comes from the Latin diligere, which means "to value highly, take delight in," but in English it has always meant careful and hard-working. If you're a diligent worker, you don't just bang away at your job; you earnestly try to do everything right. Although being lucky and talented doesn't hurt, it's the diligent person who eventually succeeds.

Definitions of diligent
  1. adjective
    quietly and steadily persevering especially in detail or exactness
    “a diligent (or patient) worker”
    synonyms: persevering
    enduring trying circumstances with even temper or characterized by such endurance
  2. adjective
    characterized by care and perseverance in carrying out tasks
    “a diligent detective investigates all clues”
    “a diligent search of the files”
    actively or fully engaged or occupied
    exercising caution or showing care or attention
    assiduous, sedulous
    marked by care and persistent effort
    hardworking, industrious, tireless, untiring
    characterized by hard work and perseverance
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    characterized by neglect and undue lack of concern
    showing a lack of attention or care
    marked by lack of attention or consideration or forethought or thoroughness; not careful
    delinquent, derelict, neglectful, remiss
    failing in what duty requires
    lax, slack
    lacking in rigor or strictness
    involving a driver of a motor vehicle who leaves the scene of an accident
    inattentive, neglectful
    not showing due care or attention
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