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[sej-uh-luh s] /ˈsɛdʒ ə ləs/
diligent in application or attention; persevering; assiduous.
persistently or carefully maintained:
sedulous flattery.
Origin of sedulous
1530-40; < Latin sēdulus, adj. derivative of the phrase sē dolō diligently, literally, without guile; replacing sedulious (see sedulity, -ous)
Related forms
sedulously, adverb
sedulousness, noun
unsedulous, adjective
unsedulously, adverb
unsedulousness, noun
1. constant, untiring, tireless. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for sedulous
Historical Examples
  • But if these gallants were sedulous, she was correspondingly indifferent.

    Under the Rose

    Frederic Stewart Isham
  • But there is nothing young in this sedulous suppression of toil.

    American Sketches Charles Whibley
  • She wondered what sort of herbs they were, which the old man was so sedulous to gather.

    The Scarlet Letter Nathaniel Hawthorne
  • "Will you kindly leave the room," he said to the sedulous Mary.

    Cripps, the Carrier

    R. D. (Richard Doddridge) Blackmore
  • He was, however, not often aware of this sedulous espionage.

    The Destroying Angel

    Louis Joseph Vance
  • In this catastrophe her lordly lover was of course the most sedulous of attendants.

    The Landleaguers

    Anthony Trollope
  • Together with the greenbottles, she is sedulous in her attendance on my pans.

    The Life of the Fly J. Henri Fabre
  • Some of them may have been millionaires; others were certainly no more than their sedulous apes.

    The Trimmed Lamp

    O. Henry
  • Never was such a sedulous mistress of languages as Henrietta Ponsonby.

    Sketches Benjamin Disraeli
  • They have been sedulous and invaluable in checking enemy propaganda.

    America's War for Humanity Thomas Herbert Russell
British Dictionary definitions for sedulous


constant or persistent in use or attention; assiduous; diligent
Derived Forms
sedulity (sɪˈdjuːlɪtɪ), sedulousness, noun
sedulously, 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
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Word Origin and History for sedulous

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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