1. the quality or state of being incapable of being annulled, voided, or made void; the condition of being legally unassailable or permanent.
Usage: formal; legal

Examples

• The indefeasibility of the title ensured that the property owner's rights could not be challenged.
• In property law, indefeasibility protects landowners from future claims against their ownership.
• The contract's indefeasibility meant it could not be cancelled or altered by either party.
• Indefeasibility is a key principle in real estate transactions to provide security to buyers.
• The court upheld the indefeasibility of the original deed despite the plaintiff's objections.