inauspicious adj. + Add to list US //ˌɪˌnaʊˈspɪʃɪs// UK //ɪnɔːspˈɪʃəs// in·aus·pi·cious SynonymsAntonymsEtymology Synonyms adverseI'llominousunfortunateuntoward Antonyms auspiciousOrigin From in- + auspicious.