Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Constant in application or attention; diligent: an assiduous worker who strove for perfection. See Synonyms at busy.
- adj. Unceasing; persistent: assiduous research.
Century Dictionary and Cyclopedia
- Constant in application; attentive; devoted: as, a person assiduous in his occupation; an assiduous physician or nurse.
- Constant; unremitting: applied to actions.
- Synonyms Sedulous, diligent, active, busy, constant, patient, persevering, laborious, unceasing, indefatigable, untiring. See assiduity.
Wiktionary
- adj. Hard-working, diligent or regular (in attendance or work); industrious.
GNU Webster's 1913
- adj. Constant in application or attention; devoted; attentive; unremitting.
- adj. Performed with constant diligence or attention; unremitting; persistent.
WordNet 3.0
- adj. marked by care and persistent effort
Etymologies
- From Latin assiduus, from assidēre, to attend to : ad-, ad- + sedēre, to sit; see sed- in Indo-European roots.
Examples
“Fine, click on the Google "News" tab – and you will be directed to a page of links where the word assiduous appears in news stories.”
The Wall Street Journal: Are Dictionaries Becoming Obsolete?
“Andy Anson, 2018's chief executive, is described as assiduous about keeping the board informed.”
“Meanwhile the hottest debate in the local party is about the use of the word "assiduous" on our election leaflets.”
“a certain number of persons who are called assiduous, exact, fulfilling their strict duty most rigorously, or, what comes to the same thing, for ever in their shops, and carrying on their trade from morning until night, and doing nothing else in the world.”
“The company is "assiduous" about hiring people who conform to the law, Ross said.”
“In October 2005, my man at Scotland Yard told me in how Sir Ian, even after Sir Gus O'Donnell, the cabinet secretary, warned leading civil servants not to regard their memoirs as an intrinsic part of their gold-plated redundancy packages, had been "assiduous" about keeping a diary.”
Telegraph.co.uk: news business sport the Daily Telegraph newspaper Sunday Telegraph
“You have heard from your most talented wordsmiths, best raconteurs, and most assiduous participants.”
“Janet is neither "the most assiduous student ... nor the most naturally gifted" (p. 121).”
“And when he is joined by Russell Barr as a Boswell who is a mixture of close companion, whipping-boy and assiduous note-taker, you feel you are eavesdropping on one of the great double-acts in literary history.”
“In the Beeb Adrian Chiles has earnt many brownie points from Aunty with his exposing of a private remark of dubious taste; his assiduous a***-licking will doubtless much improve his career.”
That’s my excuse and I’m sticking to it! « POLICE INSPECTOR BLOG
Lists
These user-created lists contain the word ‘assiduous’.
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Jesse's random
bathos, dragoman, tessellated, escutcheon, eikon, mondaine, basilisk, ciborium, rubric, machicolation, jet, defalcation and 143 more...
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GRE Barrons Wordlist
A complete Barron's Wordlist for GRE preparation. Your online flashcard replacement.
abase, abash, abate, abbreviate, abdicate, aberrant, aberration, abet, abeyance, abhor, abject, abjure and 4084 more...
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Words build meanings from origins( etymology )
These come from gamma meditation ,I think.
discursive, exogenous, machinations, purportedly, sumptuous, congruity, cantankerous, incongruous, festoon, hessian, ratiocinative, stratigraphic and 837 more...
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June Words
Words for June
connive, incessant, premeditated, malice, malicious, spite, vindictive, vindicate, vengeance, obstinately, assiduous, attentive and 14 more...
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Ruzuzu's Big Ass List
If you're looking for long s examples, see here.
ass, assess, asshole, basso profondo, basso profundo, crass, assay, mr. ass itch, compass, slag-ass macaroon, brass, class and 40 more...

reesetee Really? I always thought it sounded like the taste of lemons. May 1, 2011
blafferty This word sounds like tiny waves taking over a beach. Apr 30, 2011
jwjarvis The assiduous merchant, the laborious husbandman, the active mechanic, and the industrious manufacturer - all orders of men look forward with eager expectation and growing alacrity to the pleasing reward of their toils. Sep 16, 2010
yarb Citation on fungus garden. Dec 5, 2008