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[uh-sij-oo-uh s] /əˈsɪdʒ u əs/
constant; unremitting:
assiduous reading.
constant in application or effort; working diligently at a task; persevering; industrious; attentive:
an assiduous student.
Origin of assiduous
1530-40; < Latin assiduus, equivalent to assid(ēre) to sit near, beside, dwell close to (see assess) + -uus deverbal adj. suffix; see -ous
Related forms
assiduously, adverb
assiduousness, noun
unassiduous, adjective
unassiduously, adverb
unassiduousness, noun
1. continuous, tireless, persistent. 2. studious, diligent, sedulous.
1, 2. inconstant, lazy. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for assiduous
Contemporary Examples
Historical Examples
  • Madame Raquin was singularly touched at the assiduous care they took of her.

    Therese Raquin Emile Zola
  • I think Samoval is becoming too attentive and too assiduous.

    The Snare Rafael Sabatini
  • She was as pleasant as her husband, and I paid her an assiduous court.

    The Memoires of Casanova, Complete Jacques Casanova de Seingalt
  • Bellon was an assiduous hackney writer and translator of the day.

  • William Pyncheon had also a slave who was "assiduous in hangeing."

  • Given these things, the rest is merely a question of long and assiduous practice.

    The Wonder J. D. Beresford
British Dictionary definitions for assiduous


hard-working; persevering: an assiduous researcher
undertaken with perseverance and care: assiduous editing
Derived Forms
assiduously, adverb
assiduousness, noun
Word Origin
C16: from Latin assiduus sitting down to (something), from assidēre to sit beside, from sedēre to sit
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 assiduous

1530s, from Latin assiduus "attending; continually present, incessant; busy; constant," from assidere "to sit down to," thus "constantly occupied" at one's work; from ad "to" (see ad-) + sedere "to sit" (see sedentary). The word acquired a taint of "servility" in 18c. Related: Assiduously; assiduousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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