in·convertible \“+\adjective Etymology: probably from Late Latin inconvertibilis, from Latin in- in- (I) + convertibilis changeable — more at convertible : not capable of being changed into or exchanged for something else < the alchemists were unwilling to accept the inconvertible nature of elemental metals > a.of paper money: not exchangeable on demand for specie b.of a currency: not exchangeable for a foreign currency • in·con·vert·ibly\-əblē, -li\adverb