pac-, peac-, peas-

(Latin: peace, peaceful, calm, quiet; eased anger or agitation)

unpaid (adjective)
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."
unpayable (adjective) (not comparable)
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.
Vade in pace.
Go in peace.

Another Roman way of saying, "goodbye".

Cross references directly, or indirectly, involving "calm, calmness, peace, quiet": plac-; quies-, quiet-; seren-.