as·sid·u·ous 
/əˈsɪʤəwəs/ adjective
/əˈsɪʤəwəs/ adjective [more assiduous; most assiduous] formal : showing great care, attention, and effort
▪ They were assiduous in their search for all the latest facts and figures. ▪ The project required some assiduous planning. ▪ assiduous [=diligent] students
▪ They were assiduous in their search for all the latest facts and figures. ▪ The project required some assiduous planning. ▪ assiduous [=diligent] students
— as·si·du·ity /ˌæsəˈdu:wəti, Brit ˌæsəˈdju:wəti/ noun [noncount]
▪ the assiduity [=diligence] of the students
/ˌæsəˈdu:wəti, Brit ˌæsəˈdju:wəti/ noun [noncount] ▪ the assiduity [=diligence] of the students
— as·sid·u·ous·ly adverb
▪ He worked assiduously [=diligently] to improve his grades.
▪ He worked assiduously [=diligently] to improve his grades.
— as·sid·u·ous·ness noun [noncount]
▪ the assiduousness [=diligence] of the students
▪ the assiduousness [=diligence] of the students
