Definition of diligent (adjective)
- quietly and steadily persevering especially in detail or exactness
- "a diligent (or patient) worker"; "with persevering (or patient) industry she revived the failing business"
- synonyms: persevering
- characterized by care and perseverance in carrying out tasks
- "a diligent detective investigates all clues"; "a diligent search of the files"
- antonym: negligent
Source: Princeton University Wordnet