perfectible
Word family (noun) perfection ≠ imperfection perfectionist perfectionism perfectibility (adjective) perfect ≠ imperfect perfectible perfectionist (verb) perfect (adverb) perfectly ≠ imperfectly
From Longman Dictionary of Contemporary Englishperfectibleper‧fec‧ti‧ble /pəˈfektəbəl $ pər-/ adjective PERFECTable to be improved or made perfect —perfectibility /pəˌfektəˈbɪləti $ pər-/ noun [uncountable]