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• a  used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value

• But in a district with a mere 13% Republican registration Ardito may be preaching to the unconvertible.
• By 1948, practically all the government plants, except some unconvertible explosives factories and the $75 million Polymer synthetic rubber plant at Sarnia, Ont, had been sold.
• Taft is strong in the states that are already converted and the states that are unconvertible.

• inconvertible
• unexchangeable

• convertible