unconvertible
Adjective
Meaning
used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value
Source: WordNetSynonyms
inconvertible
unexchangeable
damned
pain
intact
irreversible
doomed
punishable
hopeless
indivisible
immutable
inalienable
incorrigible
condemned
irrevocable
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Antonyms
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I was impressed for the ten thousandth time by the fact that literature illuminates life only for those to whom books are a necessity. Books are unconvertible assets, to be passed on only to those who possess them already.