propreantepenultimate UK /ˌpɹəʊpɹiːˌæntɪpɪˈnʌltɪmət/US /ˌpɹoʊpɹiˌæntipəˈnʌltɪmət/ adjective1 •(rare) The last syllable but four (of a word or other utterance).The word minimalism is stressed on its propreantepenultimate syllable.