Unwilling (adjective)

1. Not wanting or ready to do something.
2. Not having a desire or inclination to do something.

Origin:

Middle english (in the sense 'unable'): from un- + willing.

Examples:

1. She was unwilling to help us, so we had to find another way.
2. He was unwilling to participate in the group project.
3. The company was unwilling to compromise on the terms of the contract.
4. I'm sorry, but I am unwilling to give you the information you requested.
5. The defendant was unwilling to plead guilty to the charges.