undervalue v. + Add to list US //ˈəndɝˌvæɫju// UK //ˌʌndəvˈæljuː// un·der·val·ue SynonymsAntonymsEtymology Synonyms depreciatedevaluatedevalueunderestimate Antonyms appreciateoverestimateovervalueOrigin From under- + value.