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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.

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

I had to be more diligent about closing windows on the Neo.

From The Wall Street Journal • Mar. 14, 2026

“This will hit unevenly,” Lau added, noting that big players have been diligent with recording Harmonized Tariff Schedule codes for their imports.

From MarketWatch • Feb. 20, 2026

“I would hate to criticize him for not being more diligent, but it is frustrating,” said Skyhawk in a 1995 interview about the initiative.

From Los Angeles Times • Feb. 17, 2026

The diligent students would do well to begin tonight memorizing his book on colds and fevers.

From "The Woman Warrior" by Maxine Hong Kingston