Defaulter (noun)

1. A person who fails to fulfill a financial obligation, such as a loan payment or bill.
2. A person who fails to meet an expectation, responsibility, or duty.

Origin:

From the verb default, meaning to fail to fulfill a duty or responsibility, and the suffix -er, indicating a person who performs an action.

Examples:

1. The bank repossessed his car after he became a persistent defaulter on his loan payments.
2. The company fired her for being a chronic defaulter on her project deadlines.
3. He was a notorious defaulter, never paying his debts on time and leaving a trail of angry creditors in his wake.
4. She was a reluctant defaulter, only defaulting on her loan because of unexpected medical bills.
5. The government declared him a defaulter for failing to pay his taxes and seized his assets.