Simple Definition of assiduous
: showing great care, attention, and effort
Full Definition of assiduous
: marked by careful unremitting attention or persistent application <an assiduous book collector> <tended her garden with assiduous attention>
Examples of assiduous in a sentence
They were assiduous in their search for all the latest facts and figures.
The project required some assiduous planning.
Did You Know?
Judges presiding over assizes (former periodical sessions of the superior courts in English counties) had to be assiduous in assessing how to best address their cases. Not only were their efforts invaluable, but they also served as a fine demonstration of the etymologies of "assiduous," "assess," and "assize." All three of those words derive from the Latin verb assidēre, which is variously translated as "to sit beside," "to take care of," or "to assist in the office of a judge." "Assidēre," in turn, is a composite of the prefix ad- (in this case, meaning "near" or "adjacent to") and sedēre, meaning "to sit."
Origin of assiduous
Latin assiduus, from assidēre
First Known Use: 1622
Synonym Discussion of assiduous
ASSIDUOUS Defined for Kids
Definition of assiduous for Students
: showing great care, attention, and effort <They were assiduous in gathering evidence.>
Seen and Heard
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