invalid

Null; void; without force or effect; lacking in authority.

For example, a will that has not been properly witnessed is invalid and unenforceable.

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invalid adjective abrogated, baseless, canceled, fallacious, faulty, futile, having no force, inadequate, ineffectual, inefficacious, inoperative, inritus, lacking authority, lacking force, lacking strength, not binddng, nugatory, null, quashed, unauthentic, untenable, untrue, useless, vain, void, weak, without legal efficacy
Associated concepts: invalid delegation, invalid gift, invalid transfer, invalid will
Foreign phrases: Ab abusu ad usum non valet consequennia.A conclusion as to the use of a thing from its abuse is invalid.

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See also: disabled, fallacious, false, faulty, helpless, illegal, inaccurate, inactive, inconsequential, ineffective, ineffectual, nugatory, null and void, otiose, patient, powerless, sophistic, unavailing, unsound, untenable

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INVALID. In a physical sense, it is that which is wanting force; in a figurative sense, it signifies that which has no effect.