undiligent

adjective

1. constant in effort to accomplish something; attentive and persistent in doing anything: a diligent student.
2. done or pursued with persevering attention; painstaking: a diligent search of the files.

adjective

1. careful and persevering in carrying out tasks or duties
2. carried out with care and perseverancediligent work

adj.mid-14c., from Old French diligent (14c.), from Latin diligentem “attentive, assiduous” (see diligence). Related: Diligently.