Definition of assiduous adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//əˈsɪdjuəs//
; NAmE NAmE//əˈsɪdʒuəs//
(formal) Job skills and personal qualities
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working very hard and taking great care that everything is done as well as it can be synonym diligent one of the most assiduous members of the team their assiduous efforts and attention to detail She was assiduous in her duties. See related entries: Job skills and personal qualities Word Originmid 16th cent.: from Latin assiduus, from assidere ‘be engaged in doing’ from ad- ‘to, at’ + sedere ‘sit’, + -ous.
See the Oxford Advanced American Dictionary entry: assiduous