Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: asiduus, from assidere; ASSESS

assiduous

 adjective
     
as‧sid‧u‧ous formal
very careful to make sure that something is done properly or completely [= meticulous]
assiduous in
He was assiduous in his attendance at church.
—assiduously adverb:
Even young children worked assiduously for a reward.
—assiduity noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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