unreturnable

adjective

1. that may be returned: returnable merchandise.
2. requiring a return, as a writ to the court from which it is issued.

noun

3. a beverage bottle or can that can be returned when empty for refund of a deposit.

adjective

1. able to be taken, given, or sent back
2. required to be returned by law, as a claim to the court from which it issued

adj.early 15c., from return (v.) + -able.