diligent

adjective

dil·​i·​gent ˈdi-lə-jənt 

: characterized by steady, earnest, and energetic effort : painstaking

a diligent worker

diligently adverb

Did you know?

You’re more likely to be diligent about something if you love doing it. The etymology of diligent reflects the fact that devotion can lead to energetic effort. The word, which entered English in the 14th century by way of Anglo-French, comes from the Latin verb diligere, meaning “to value or esteem highly” or “to love.” Diligere was formed by combining the di- prefix (from dis-, meaning “apart”) with the verb legere, meaning “to gather, select” or “to read.” Legere has itself proved to be a diligent contributor to English; its offspring include collect, lecture, legend, intelligent, and legume.

Synonyms

• active
• assiduous
• bustling
• busy
• employed
• engaged
• hopping
• industrious
• laborious
• occupied
• sedulous
• tied-up
• working

Choose the Right Synonym for diligent

busy, industrious, diligent, assiduous, sedulous mean actively engaged or occupied.

busy chiefly stresses activity as opposed to idleness or leisure.

too busy to spend time with the children

industrious implies characteristic or habitual devotion to work.

industrious employees

diligent suggests earnest application to some specific object or pursuit.

very diligent in her pursuit of a degree

assiduous stresses careful and unremitting application.

assiduous practice

sedulous implies painstaking and persevering application.

a sedulous investigation of the murder

Examples of diligent in a Sentence

The American intelligence community's single greatest failing is its lack of good "humint"—human intelligence, the dirty, diligent, shoe-leather penetration of terror networks. —Johanna McGeary, Time, 15 Oct. 2001

Like any diligent foreign correspondent, he attends the briefings and collects face time with the officials, but he knows it's the citizens … who tell the truth … —Rolling Stone, 19 Sept. 1996

He was a fourth-year drama student at UCLA and diligent about such valuable actorly exercises as eavesdropping, spying, and telling complicated lies to fellow passengers on airplanes. —Michael Chabon, A Model World and Other Stories, 1991

In spite of diligent work as editor, hack writer, sea captain, and assorted other trades, he wound up poor. —Monroe K. Spears, American Ambitions, 1987

a student who has been unceasingly diligent in pursuit of a degree in mathematics

Recent Examples on the Web

This means investors need to conduct diligent research into both financial and ethical factors. —Sahit Muja, Forbes.com, 16 Apr. 2025

Kai seems like a sweet kid — a diligent server, a talented performer, loyal to Paula despite being tempted by her best friend, Olivia (played by Sydney Sweeney). —Eddie Mouradian, Vulture, 7 Apr. 2025

With inflation and tariffs severely affecting the U.S. economy, grocery shoppers may need to be more diligent in their couponing going forward. —Jonathan Limehouse, USA Today, 6 Apr. 2025

After analyzing his journal, Cordelia was able to decipher the diligent log Wynter kept of each criminal statute and ethical code that Lilly broke while working her role at the White House, which included stealing money and securing shady contracts. —Lexy Perez, The Hollywood Reporter, 24 Mar. 2025

Word History

Etymology

Middle English, from Anglo-French, from Latin diligent-, diligens, from present participle of diligere to esteem, love, from di- (from dis- apart) + legere to select — more at legend

First Known Use

14th century, in the meaning defined above

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Kids Definition

diligent

adjective

dil·​i·​gent ˈdil-ə-jənt 

: showing steady and earnest care and effort : painstaking

a diligent search

a diligent worker

diligently adverb