the state of being impracticable
a doctrine in contract law: relief from obligations under a contract may be granted when performance has been rendered excessively difficult, expensive, or harmful by an unforeseen contingency
a defense to breach of contract on the ground that it has been rendered impracticable called also commercial impracticability
impracticability of performance
impossibility of performance
NOTE: Under section 2-615 of the Uniform Commercial Code, the impracticability must arise “by the occurrence of contingency the non-occurrence of which was a basic assumption on which the contract was made” or by compliance with the law.
excessive difficulty in carrying out a procedure (as joinder)