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Meaning:
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not valid; invalidate; weak or disabled because of illness or injury; suitable for invalid persons

worthless; unfounded

baseless false inoperative irrational null unreasonable unscientific unsound untrue bad void wrong fallacious ill-founded illogical mad not binding not working nugatory null and void reasonless sophistic unreasoned
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Cases of word usage

1) not valid; invalidate; weak or disabled because of illness or injury; suitable for invalid persons (invalid)

INVALID as in Wiktionary
INVALID as in Wikipedia