inconvertible
adjective
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
inconvertibility
ˌin-kən-ˌvər-tə-ˈbi-lə-tē
noun inconvertibly
ˌin-kən-ˈvər-tə-blē
adverb 
Example Sentences
Recent Examples on the Web They are afflicted with a love for ideas that have repeatedly produced inconvertible failure and should be dead. 
Steve H. Hanke, National Review, 1 Sep. 2021 The first temptation was for the Song authorities to make the jiaozi inconvertible, severing the connection with metal reserves. Edward Chancellor, WSJ, 10 Mar. 2021 The previous year, Nixon unilaterally made the dollar inconvertible to gold. New York Times, 7 Feb. 2021
Steve H. Hanke, National Review, 1 Sep. 2021 The first temptation was for the Song authorities to make the jiaozi inconvertible, severing the connection with metal reserves. Edward Chancellor, WSJ, 10 Mar. 2021 The previous year, Nixon unilaterally made the dollar inconvertible to gold. New York Times, 7 Feb. 2021 Word History
Etymology
probably from Late Latin inconvertibilis, from Latin in- + convertibilis convertible
First Known Use
1646, in the meaning defined above
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