Definitions:

1. Approaching something with intense focus and a sense of importance. NOUN
   • He pursued his studies with great earnestness.
2. Displaying honesty and a lack of superficiality or frivolity. NOUN
   • His earnestness during the speech showed how much he cared about the cause.
3. The state or quality of showing genuine, heartfelt commitment or conviction. NOUN
   • Her earnestness in addressing the issue won everyone's respect.

Synonyms:

• commitment
• dedication
• intensity
• seriousness
• sincerity
• solemnity