Definitions:

1. A detailed and conscientious effort to complete a task, often associated with research, verification, or compliance. NOUN
   • The lawyers performed due diligence before finalizing the contract.
2. Giving the degree of care required in a given situation. NOUN
   • His diligence in preparing the report impressed the entire team.
3. The quality of being committed and persistent in one's work or efforts, showing care, dedication and determination in one's tasks or responsibilities. NOUN
   • The musician practiced her scales with unwavering diligence, striving for perfection in her craft.
4. The quality of being hardworking, thorough, and persistent in achieving a goal. NOUN
   • Her diligence in studying led to her success in the exams.

Synonyms:

• application
• assiduity
• attention
• attentiveness
• effort
• industriousness
• persistence