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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.

My best guess is that Cassidy and Kaine themselves — being the intelligent and diligent legislators they are — would prefer a serious approach and offer this proposal simply to move their colleagues to action.

From MarketWatch • Apr. 9, 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

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

From The Wall Street Journal • Mar. 14, 2026

She was good at her work—fast, nimble-fingered, diligent, and even in the nearly unbearable heat of the weaving room, apparently indefatigable.

From "Lyddie" by Katherine Paterson