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.
his secretary said he was unavailable for comment
fresh milk was unavailable during the emergency
unattended
unattested
unattractive
unauthorized
unavailability
unavailable
unavailing
unavoidable
unaware
unawares
unbalance
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