invalid

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Invalid

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

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

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

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

References in classic literature ?
On the afternoon of the second day, she went out to do an errand, and give poor Joanna, the invalid doll, her daily exercise.
Half invalid as she was, Ona would do herself harm by walking in the rain and cold when she ought to have ridden; they bought literally nothing but food--and still they could not keep alive on fifty dollars a month.
In spite of his invalid back Colin sat up in bed in quite a healthy rage.
We shall greatly miss Edmund in our small circle, but I trust and hope he will find the poor invalid in a less alarming state than might be apprehended, and that he will be able to bring him to Mansfield shortly, which Sir Thomas proposes should be done, and thinks best on every account, and I flatter myself the poor sufferer will soon be able to bear the removal without material inconvenience or injury.
That summer the invalids of the regiment to which my friend belonged were ordered off to the Hills early, because the doctors thought marching in the cool of the day would do them good.
No part of a woman is more dangerous than her muff, and as muffs are not worn in early autumn, even by invalids, I saw in a twink, that she had put on all her pretty things to wheedle me.
People began to come to him from a distance, and began bringing invalids to him whom they declared he cured.
I answered advertisements of elderly invalids in need of companions.
Nor on ours," replied unanimously all the bellicose invalids.
Little hairless dogs are in great request to sleep at the feet of invalids.
Thanks to him, we managed to regain the town, which our invalids had put more or less in a state of defence, but it was pitiful to see it.
You would compare them, I said, to those invalids who, having no self-restraint, will not leave off their habits of intemperance?