Hypertext Webster Gateway: "unexchangeable"
From WordNet (r) 1.7 (wn)
unexchangeable
adj 1: not suitable to be exchanged [ant: {exchangeable}]
2: used especially of currencies; incapable of being exchanged
for or replaced by another currency of equal value [syn: {inconvertible},
{unconvertible}] [ant: {convertible}]
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