assiduous

[ uh-sij-oo-uhs ]
/ əˈsɪdʒ u əs /

adjective

constant; unremitting: assiduous reading.
constant in application or effort; working diligently at a task; persevering; industrious; attentive: an assiduous student.

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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

OTHER WORDS FROM assiduous

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for assiduousness

British Dictionary definitions for assiduousness

assiduous
/ (əˈsɪdjʊəs) /

adjective

hard-working; perseveringan assiduous researcher
undertaken with perseverance and careassiduous editing

Derived forms of assiduous

assiduously, 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