working very hard and taking great care that everything is done as well as it can be synonym diligent兢兢业业的;勤勤恳恳的 one of the most assiduous members of the team 团队中最勤奋的成员之一 their assiduous efforts and attention to detail 他们孜孜不倦的努力和对细节的关注 She was assiduous in her duties. 她尽职尽责。
Word Originmid 16th cent.: from Latin assiduus, from assidere ‘be engaged in doing’ from ad- ‘to, at’ + sedere ‘sit’, + -ous.