impracticable, infeasible, unfeasible, unworkable (adj)

not capable of being carried out or put into practice

"refloating the sunken ship proved impracticable because of its fragility"; "a suggested reform that was unfeasible in the prevailing circumstances"

impracticable (Noun)

An unmanageable person.

impracticable (Adjective)

Not practicable; impossible or difficult in practice.

impracticable (Adjective)

Of a passage or road: impassable.

impracticable (Adjective)

Of a person or thing: unmanageable.

impracticable

The doctrine of impracticability in the common law of contracts excuses performance of a duty, where the said duty has become unfeasibly difficult or expensive for the party who was to perform. Impracticability is similar in some respects to the doctrine of impossibility because it is triggered by the occurrence of a condition which prevents one party from fulfilling the contract. The major difference between the two doctrines is that while impossibility excuses performance where the contractual duty cannot physically be performed, the doctrine of impracticability comes into play where performance is still physically possible, but would be extremely burdensome for the party whose performance is due. Thus, impossibility is an objective condition, whereas impracticability is a subjective condition for a court to determine. Typically, the test U.S. courts use for impracticability is as follows (with a few variations among different jurisdictions): There must be an occurrence of a condition, the nonoccurrence of which was a basic assumption of the contract, The occurrence must make performance extremely expensive or difficult This difficulty was not anticipated by the parties to the contract (note: some jurisdictions require that there be no measure within the contract itself to allocate risk between the parties)