unappreciated adj. + Add to list US //ˌənəˈpɹiʃiˌeɪtɪd// UK //ʌnɐpɹˈiːʃɪˌeɪtɪd// un·ap·pre·ci·at·ed SynonymsEtymology Synonyms thanklessungratifyingunsungunvaluedOrigin From un- + appreciated.