definitions

assiduous

[ uh-sij-oo-uhs ]
/ əˈsɪdʒ u əs /
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SEE MORE SYNONYMS FOR assiduous ON THESAURUS.COM

adjective

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

RELATED WORDS

diligent, zealous, scrupulous, indefatigable, exacting, laborious, active, attentive, busy, constant, grinding, industrious, persevering, sedulous, steady, studious, unflagging, untiring, whiz, plugging

Nearby words

asshur, assibilate, assidean, assideans, assiduity, assiduous, assign, assignable, assignat, assignation, assignats

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for assiduous

British Dictionary definitions for assiduous

assiduous

/ (əˈsɪdjʊəs) /

adjective

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

Derived Forms

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