American English

Definition of assiduous adjective from the Oxford Advanced American Dictionary



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  1. 1working very hard and taking great care that everything is done as well as it can be synonym diligent
  2. 2 one of the most assiduous members of the team their assiduous efforts and attention to detail She was assiduous in her duties.
, NAmE//‑ˈdʒu‑//
noun [uncountable]
assiduously adverb
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He worked assiduously to earn the money for his son's education.
See the Oxford Advanced Learner's Dictionary entry: assiduous