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90s Slang You Should Know


[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. 2017.
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Examples from the Web for assiduously
Contemporary Examples
Historical Examples
  • What I have mentioned above of their dressing their heads too assiduously, is the case with all the ladies throughout Canada.

  • She practised these accompaniments every afternoon, as assiduously as any school‑girl.

    The Martian George Du Maurier
  • He had a genuine talent for administration, and he devoted this talent most assiduously to selfish ends.

  • Plato had assiduously labored at the solution of this problem.

    Christianity and Greek Philosophy Benjamin Franklin Cocker
  • The month of December was assiduously employed in and about the region last mentioned.

    Memoir of Rev. Joseph Badger Elihu G. Holland
British Dictionary definitions for assiduously


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 assiduously



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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