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assiduous

adjective

as·​sid·​u·​ous ə-ˈsij-wəs How to pronounce assiduous (audio)
-ˈsi-jə-
: showing great care, attention, and effort : marked by careful unremitting attention or persistent application
assiduous planning
an assiduous book collector
She tended her garden with assiduous attention.
assiduously adverb
assiduousness noun

Did you know?

While assiduous means “showing great care, attention, and effort,” and in some situations may be an appropriate substitute for careful, it’s got a bit more oomph than careful in that it suggests a dogged or tireless persistence. If you are assiduous in your efforts (or work, research, analysis, training, preparations, etc.) for example, it’s implied that you’re in it for the long haul, or that you have the ability to “sit with” a task or challenge for a considerable amount of time. This makes sense given that assiduous comes from the Latin verb assidēre, meaning “to sit beside.”

Did you know?

The History of Assiduous

Assiduous came to English directly from the Latin assiduus, an adjective derived from the verb assidēre "to sit beside." To the ancient Romans, assiduus carried meanings ranging from “settled or rooted in place” to “constantly present” to “persistent, unremitting." This last sense was the one borrowed into English four hundred years ago and still used today, often in complimentary phrases such as "an assiduous student" and “assiduous efforts.” In the 18th century, the word took on a mildly pejorative meaning, "exhibiting a fawning attentiveness; obsequious," when used of someone striving to please. This sense has largely passed out of use.

Choose the Right Synonym for assiduous

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

Example Sentences

They were assiduous in their search for all the latest facts and figures. The project required some assiduous planning.
Recent Examples on the Web Knowledgeable and assiduous consumers are the impetus needed to push the tipping point. Michelle Williams, Forbes, 20 May 2022 Digitally savvy Ukrainians have been assiduous in their fight to bring Russians to justice for war crimes. Dominique Soguel, The Christian Science Monitor, 10 June 2022 In the end, rather than convincing us that Chernobyl was a typical nuclear accident, Mr. Plokhy’s assiduous account shows that the disaster was the product of a uniquely corrupt and inhumane political system. James B. Meigs, WSJ, 20 May 2022 The administration's assiduous efforts to ease supply chain backups at ports and internal transportation hubs can help only at the margins. John Harwood, CNN, 1 Apr. 2022 Outsider Pictures is an assiduous distributor of Spanish-language films. Justin Morgan, Variety, 10 Mar. 2022 Both paintings combine aspects of stylized illustration—industrial clouds of smoke, slanting rain—with painterly effects and an investigation of reality at once intermittent and assiduous. Garth Greenwell, The New Yorker, 15 Feb. 2022 Finkelstein attacked the route with an assiduous efficiency. Zach Helfand, The New Yorker, 31 Jan. 2022 This moniker implied moral imperatives, ethical perfection and assiduous attention to putting patients first. Shakeel Ahmed, Forbes, 5 Nov. 2021 See More

Word History

Etymology

Latin assiduus, from assidēre to sit beside

First Known Use

circa 1552, in the meaning defined above

Time Traveler
The first known use of assiduous was circa 1552

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