Did You Know?
We acquired "indefeasible" in the mid-16th century by combining the English prefix in- ("not") with "defeasible," a word borrowed a century earlier from Anglo-French. "Defeasible" itself can be traced to an Old French verb meaning "to undo" or "to destroy." It's no surprise, then, that something indefeasible is essentially "un-undoable" or "indestructible." Another member of this family of words is feasible, meaning "capable of being done or carried out." Ultimately, all three - "indefeasible," "defeasible," and "feasible" - can be traced back to the Latin verb facere, meaning "to do."
First Known Use of indefeasible
Legal Definition of indefeasible
: not capable of being annulled or voided <an indefeasible right>
Learn More about indefeasible
Seen and Heard
What made you want to look up indefeasible? Please tell us where you read or heard it (including the quote, if possible).