Unexpendable

Part of speech: adjective

Definitions

1. Not capable of being spent or consumed; describing something that cannot be wasted or used up; referring to an entity that remains intact and available for use
2. Incapable of being utilized or depleted in any way; indicating a resource that must be preserved rather than exhausted; highlighting a quality of being indispensable and enduring
3. Unable to be exhausted or depleted through use; characterizing a resource that is vital and must be conserved; suggesting an essential element that continues to exist without diminishing

Etymology: "Unexpendable" is a straightforward formation: the prefix "un-", meaning "not," attached to "expendable." That second word comes from "expend," which traces back through Middle English and Old French to the Latin "expendere," meaning "to weigh out" or "to pay out." The core idea is weighing or paying out a sum, and "expendable" later took on the sense of something that can be spent or used up without serious loss. Adding "un-" reverses that sense, so "unexpendable" describes something that cannot be used up or wasted. The word is rare in everyday English, and its meaning is transparent from its parts, so the construction tells the whole story.

Synonyms: indispensable, essential, necessary, vital, crucial

Antonyms: expendable, unnecessary, optional, superfluous, disposable