Etymology
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unavailable (adj.)

1540s, "ineffectual," from un- (1) "not" + available. Meaning "incapable of being used" is recorded from 1855. Unavailing has taken up the older sense of the word.

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Definitions of unavailable

unavailable (adj.)
not available or accessible or at hand;
his secretary said he was unavailable for comment
fresh milk was unavailable during the emergency
From wordnet.princeton.edu