Definition of "unavailable"

unavailable

/ˌʌnəˈveɪləbəl/

adjective
comparative more unavailable, superlative most unavailable
1. (obsolete) Unavailing; ineffective.
  Quotations
  To recriminate now, he said, would be as exasperating as unavailable.
  1748, [Samuel Richardson], “Letter DXXXVI”, in Clarissa. Or, The History of a Young Lady: […], volumes (please specify |volume=I to VII), London: […] S[amuel] Richardson; […]
2. Not available.
noun
plural unavailables
1. (US, history) A communist who operated underground and was therefore not available for a political leadership position.