in·con·vert·ible
ˌin-kən-ˈvər-tə-bəl
: not convertible: such as
a
of paper money
: not exchangeable for coin
b
of a currency
: not exchangeable for a foreign currency
: the quality or state of being inconvertible
—used chiefly of foreign exchange
… the ruble is an archaic pseudo-currency. Its medium of exchange function is severely circumscribed by both foreign and domestic inconvertibility.—
Edgar L. Feigue, The Cato Journal, Winter 1991
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