What does indefeasibility mean?
Indefeasibility is the quality of being impossible to defeat, invalidate, or overturn. The term is especially common in legal and political contexts when discussing rights, protections, rules, or principles that cannot be removed or set aside through ordinary proceedings or later circumstances. A right described as having indefeasibility differs from a merely durable right: it is understood to be protected against any exception, qualification, or valid challenge. In practice, the expression is often associated with absolute constitutional protections or foundational principles of law. Outside technical contexts, it may convey the strong idea that something is permanent or beyond legitimate reversal. Because it is more precise and formal than words such as immutability, indefeasibility is best used when discussing the enforceability or absolute character of a specific right or rule.
nounThe quality of being impossible to defeat, invalidate, or overturn. It most often refers to a legal right, rule, or principle that cannot be removed or set aside by ordinary circumstances.
- The condition of being unable to be defeated, invalidated, or overturned, especially as the quality of a legal or constitutional right.
"The court considered the constitutional protections and their indefeasibility."
"Lawmakers debated whether the protection was intended to possess complete indefeasibility."
"The decision emphasized the indefeasibility of the agreement once all formal conditions had been met."
Plural forms are rare and are most likely to occur in scholarly or legal writing.
"The court examined the differing indefeasibilities of statutory and constitutional protections."
A defeasible right can be overridden, but an indefeasible right is designed to withstand every ordinary challenge.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does indefeasibility come from?
The word was formed in the 17th century from the prefix in-, meaning “not,” and defeasible, meaning “liable to be defeated or overthrown.” Defeasible derives from Anglo-French defeasible and Latin deficere, from de-, meaning “away or down,” and facere, meaning “to make or do.” The related terms feasible, feasibility, and defeasibility preserve the same Latin root.
Related word forms
How indefeasibility is actually used
This is a formal and relatively uncommon term, especially associated with law, political philosophy, and ethics. It is more specific than general immutability because it often implies that no valid challenge or exception can defeat the thing being described.