inconvertible, adj.
not capable of being changed into something else
<adj.all>
inconvertible untransmutable
sample sentences
"the alchemists were unable to accept the inconvertible nature of elemental metals"
semantic pointers
similar to
used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value
<adj.all>
inconvertible unconvertible unexchangeable
lexical pointers
derivationally related form