as in weak
chronically or repeatedly suffering from poor health
an old and now invalid woman who rarely gets out anymore
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1
as in null
having no legal or binding force
the treaty is invalid once one side violates it
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2
as in erroneous
not being in agreement with what is true
that's an invalid assumption on your part
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3
as in unreasonable
not using or following good reasoning
an argument which has one untrue premise is invalid
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4
as in unsupported
having no basis in reason or fact
an invalid claim that can be easily disproved by the facts
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as in to impair
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Merriam-Webster unabridged
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