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assiduous

[uh-sij-oo-uh s]
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adjective
  1. constant; unremitting: assiduous reading.
  2. 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 formsas·sid·u·ous·ly, adverbas·sid·u·ous·ness, nounun·as·sid·u·ous, adjectiveun·as·sid·u·ous·ly, adverbun·as·sid·u·ous·ness, noun

Synonyms

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1. continuous, tireless, persistent. 2. studious, diligent, sedulous.

Antonyms

1, 2. inconstant, lazy.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for assiduous

assiduous

adjective
  1. hard-working; perseveringan assiduous researcher
  2. undertaken with perseverance and careassiduous editing
Derived Formsassiduously, adverbassiduousness, 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

Word Origin and History for assiduous

adj.

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