working very hard and taking great care that everything is done as well as it can be 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. 她在工作上很刻苦。
Word Originmid 16th cent.: from Latin assiduus, from assidere ‘be engaged in doing’ from ad- ‘to, at’ + sedere ‘sit’, + -ous.