forbidden / invalid

simple past tense and past participle of disallow

Able to be disallowed. / Not allowable; not to be suffered or permitted; which should not be allowed.

One who disallows or forbids.

plural of disallower

To refuse to allow / To reject as invalid, untrue, or improper / (UK, law, historical) to overrule a colonial legislation by the sovereign-in-privy council

present participle of disallow

Third-person singular simple present indicative form of disallow

The quality of being disallowable.

plural of disallowance