Antonyms of adj unconvertible
1 sense of unconvertible                                                
Sense 1
inconvertible (vs. convertible), unconvertible, unexchangeable -- (used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value)
Similarity of adj unconvertible
1 sense of unconvertible                                                
Sense 1
inconvertible (vs. convertible), unconvertible, unexchangeable -- (used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value)
       => irredeemable -- ((of paper money) not convertible into coin at the pleasure of the holder)

