assiduous

adjective
as·​sid·​u·​ous | \ ə-ˈsij-wəs How to pronounce assiduous (audio) , -ˈsi-jə- \

Definition of assiduous

: 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.

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Other Words from assiduous

assiduously adverb
assiduousness noun

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

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, "obsequious," when used of someone striving to please. This sense has largely passed out of use.

Did You Know?

Judges presiding over assizes (former periodical sessions of the superior courts in English counties) had to be assiduous in assessing how to best address their cases. Not only were their efforts invaluable, but they also served as a fine demonstration of the etymologies of "assiduous," "assess," and "assize." All three of those words derive from the Latin verb assidēre, which is variously translated as "to sit beside," "to take care of," or "to assist in the office of a judge." "Assidēre," in turn, is a composite of the prefix ad- (in this case, meaning "near" or "adjacent to") and sedēre, meaning "to sit."

Examples of assiduous in a Sentence

They were assiduous in their search for all the latest facts and figures. The project required some assiduous planning.
Recent Examples on the Web Trump’s businesses rely heavily on the use of his name, branding everything from Trump Steaks to Trump Ice Natural Spring Water, and the former president and his company have been assiduous in protecting it. Rob Crilly, Washington Examiner, "'What's he going to do? Sue the RNC?': Republicans ignore Trump's cease-and-desist letters," 8 Mar. 2021 But Luisi and the orchestra gave it assiduous attention, and in an age of so much assaultive new music, a dreamy escape was welcome. Scott Cantrell, Dallas News, "Fabio Luisi leads Dallas Symphony premiere of atmospheric Angélica Negrón piece," 5 Feb. 2021 An assiduous public-relations campaign has ensured that the newspapers bulge with profiles of him and his photogenic family. The Economist, "Bagehot Rishi Sunak, Thatcherite at heart," 28 Nov. 2020 The only way to find anything is by searching hashtags, which means that countless posts on the site are little more than agglomerations of hashtags and the assiduous spammers who take advantage of them. Los Angeles Times, "Column: Parler’s vibe is MAGA-red and unreal. Extremism by design?," 25 Nov. 2020 Penned and performed with deadpan keenness and sincere poignancy by Covino and real-life greatest pal Kyle Marvin — both surely assiduous cinephiles — the exceptionally auspicious first feature defies superfluous bromance movie conventions. Carlos Aguilar, Los Angeles Times, "Review: Is ‘The Climb’ the greatest bromantic comedy ever?," 11 Nov. 2020 The number of positive tests among players remains low; the testing regimen is thorough and assiduous. Rory Smith, New York Times, "There Is No Such Thing as a Bad Player," 6 Nov. 2020 Like all good emo, the record was beloved by the most assiduous arbiters of feeling—teenagers, who embraced the band’s earnest yet playful approach to youthful angst. Hannah Giorgis, The Atlantic, "The Audacity of Panic! at the Disco’s Debut Album," 30 Sep. 2020 There was much talk beforehand about the Democrats’ ardent desire and assiduous efforts to project unity. Frank Bruni New York Times, Star Tribune, "Michelle Obama showed us why these Democrats are our last best hope," 18 Aug. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'assiduous.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of assiduous

circa 1552, in the meaning defined above

History and Etymology for assiduous

Latin assiduus, from assidēre to sit beside

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Time Traveler for assiduous

Time Traveler

The first known use of assiduous was circa 1552

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Last Updated

14 Mar 2021

Cite this Entry

“Assiduous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/assiduous. Accessed 11 Apr. 2021.

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More Definitions for assiduous

assiduous

adjective
as·​sid·​u·​ous | \ ə-ˈsi-jə-wəs How to pronounce assiduous (audio) \

Kids Definition of assiduous

: showing great care, attention, and effort They were assiduous in gathering evidence.

Other Words from assiduous

assiduously adverb

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Comments on assiduous

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