Refusal (noun)

1. The act of refusing or declining a request, offer, or invitation.
2. An instance of refusing.

Origin:

From old french refus, from latin refusus, past participle of refutare "repel, reject".

Examples:

1. His refusal to participate in the project was a major setback.
2. The company's refusal to pay the bill led to a lawsuit.
3. She was surprised by his refusal of her marriage proposal.
4. The refusal of the visa application caused a lot of inconvenience.
5. The teacher's refusal to change the grade was final.