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assiduous

[uh-sij-oo-uh s] /əˈsɪdʒ u əs/
adjective
1.
constant; unremitting:
assiduous reading.
2.
constant in application or effort; working diligently at a task; persevering; industrious; attentive:
an assiduous student.
Origin
1530-1540
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
Synonyms
1. continuous, tireless, persistent. 2. studious, diligent, sedulous.
Antonyms
1, 2. inconstant, lazy.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for assiduousness

assiduous

/əˈsɪdjʊəs/
adjective
1.
hard-working; persevering: an assiduous researcher
2.
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 assiduousness

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
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