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 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 for assiduous

Antonyms for assiduous Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for assiduous

Contemporary Examples of assiduous

Historical Examples of assiduous

British Dictionary definitions for assiduous



hard-working; perseveringan assiduous researcher
undertaken with perseverance and careassiduous editing
Derived Formsassiduously, adverbassiduousness, noun

Word Origin for assiduous

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

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