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

adj quietly and steadily persevering especially in detail or exactness

“a diligent (or patient) worker”
enduring trying circumstances with even temper or characterized by such endurance

adj 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
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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