The word "unalienable" is a legal and philosophical term built upon the concept of rights that are inherent and cannot be transferred. Its core, "alien," originates from the Latin aliēnus, meaning "of another," which itself stems from alius ("other"). In property law, to "alienate" means to transfer ownership to another party. By adding the negating prefix "un-" and the capability suffix "-able," the word constructs the precise meaning of something—most famously fundamental rights—that is inherently incapable of being transferred or given away to another's authority. This etymological journey from "otherness" to "transferability" and finally to "non-transferability" encapsulates the Enlightenment ideal of rights that are intrinsic to human existence.

Structure: un (not) + alien (transfer) + able (capable of) - un: A prefix of Germanic origin (Old English) meaning "not," used to form negatives. - alien: From Latin aliēnus ("belonging to another, foreign"), derived from alius ("other"). In this context, it carries the sense of "transferring to another owner." - able: A suffix from Latin -ābilis, indicating capacity or suitability.