nonrefundable

The word is a modern legal and commercial compound built from established English morphemes. The core, "refund," originates from the Latin verb refundere, meaning "to pour back," which metaphorically evolved into the financial sense of returning money. The prefix "non-," a straightforward negator from Latin, is attached to create the opposite meaning. Finally, the adjectival suffix "-able," also of Latin origin via French, is added to indicate the quality or state of being capable of that action—or in this case, incapable. Thus, the literal construction "not capable of being paid back" precisely defines the modern contractual condition where a payment is final and cannot be reclaimed.

Structure: non (not) + refund (to pay back) + able (capable of) - non: A prefix of Latin origin, meaning "not," used to form negatives. - refund: A verb from Latin refundere (to pour back, restore), via Anglo-Norman French. In this compound, it functions as the core lexical root. - able: A suffix from Latin -abilis, via Old French, meaning "capable of, fit for," used to form adjectives.