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  1. diligent in application or attention; persevering; assiduous.
  2. persistently or carefully maintained: sedulous flattery.
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Origin of sedulous

1530–40; < Latin sēdulus, adj. derivative of the phrase sē dolō diligently, literally, without guile; replacing sedulious (see sedulity, -ous)
Related formssed·u·lous·ly, adverbsed·u·lous·ness, nounun·sed·u·lous, adjectiveun·sed·u·lous·ly, adverbun·sed·u·lous·ness, noun


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1. constant, untiring, tireless.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for sedulously


  1. constant or persistent in use or attention; assiduous; diligent
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Derived Formssedulity (sɪˈdjuːlɪtɪ) or sedulousness, nounsedulously, adverb

Word Origin

C16: from Latin sēdulus, of uncertain origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for sedulously



1530s, from Latin sedulus "attentive, painstaking, diligent, busy, zealous," probably from sedulo (adv.) "sincerely, diligently," from sedolo "without deception or guile," from se- "without, apart" (see secret) + dolo, ablative of dolus "deception, guile," cognate with Greek dolos "ruse, snare." Related: Sedulously; sedulousness.

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Online Etymology Dictionary, © 2010 Douglas Harper