diligent
adjective
1. quietly and steadily persevering especially in detail or exactness
- a diligent (or patient) worker
Similar word(s): patient, persevering
2. characterized by care and perseverance in carrying out tasks
- a diligent detective investigates all clues
- a diligent search of the files
Similar word(s): busy, careful, assiduous, sedulous, hardworking, industrious, tireless, untiring