undifferentiated adj. + Add to list US //əndɪfɝˈɛnʃiˌeɪtɪd// UK //ʌndˌɪfəɹˈɛnʃɪˌeɪtɪd// un·dif·fer·en·ti·at·ed SynonymsAntonymsEtymology Synonyms uniform Antonyms differentiatedOrigin From un- + differentiated.