Not convertible; not capable of being transmuted, changed into, or exchanged for, something else; as, one metal is inconvertible into another; bank notes are sometimes inconvertible into specie
not capable of being changed into something else; "the alchemists were unable to accept the inconvertible nature of elemental metals" used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value
not capable of being changed into something else; "the alchemists were unable to accept the inconvertible nature of elemental metals"