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Definitions

diligent

[dil-i-juhnt] / ˈdɪl ɪ dʒənt /
ADJECTIVE
persevering, hard-working
Synonyms
STRONGEST
active assiduous attentive careful conscientious eager earnest indefatigable industrious painstaking persistent studious tireless
WEAK
busy constant eager beaver grind laborious occupied operose persisting pertinacious plugging sedulous steadfast unflagging unrelenting untiring
Antonyms
STRONGEST
careless disinterested idle ignorant inactive inattentive lazy neglectful thoughtless tired uncareful unconcerned unenthusiastic unscrupulous weary
WEAK
indifferent languid lethargic negligent

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“I was wild and in the streets, not diligent in any way about anything, but I really loved it.”

From Los Angeles Times • Mar. 25, 2026

There was no diligent retailer in the Philippines who realized they overcharged you for an eBay or Amazon purchase you had forgotten you made years ago, and miraculously wanted to make you whole.

From MarketWatch • Mar. 25, 2026

In a report published last year the UK Covid Inquiry praised the former first minister as a "serious and diligent leader", but said she "often excluded" some government ministers and advisers from key discussions.

From BBC • Mar. 24, 2026

Gauci suggests the "quite remarkable" notebook suggests Geisel had been "studious" and was doing "diligent work".

From BBC • Mar. 2, 2026

He’s back out in the garage being diligent again.

From "Dry" by Neal Shusterman and Jarrod Shusterman

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.