Diligent (adjective)

1. Hardworking, persevering and showing great care in one's work or duties.
2. Conscientiously or attentively applied.

Origin:

Derived from the latin word 'diligere' meaning 'to love, care for'.

Examples:

1. She was diligent in her studies and always achieved top marks.
2. The diligent worker was always the first to arrive and the last to leave.
3. The diligent detective solved the case with careful attention to detail.
4. The diligent chef carefully prepared each dish to perfection.
5. The diligent nurse provided excellent care for her patients.