pac-, peac-, peas-

1. Without payment.
2. Awaiting payment or settlement; such as, unpaid bills.
3. Not yet in receipt of payment for work done.
4. Working without wages or a salary.
5. Serving without pay; unsalaried: "We worked as unpaid research assistants."

1. Not eligible for receiving wages: They served in an unpayable volunteer fire department.
2. Engaged in a pastime and so not to acquire a salary: An amateur painter likes to paint as a hobby, which is an unplayable activity.
3. Incapable of getting money back: The bill was unpayable because the owner couldn't find the girl who had bought the dress.

Go in peace.

Another Roman way of saying, "goodbye".