Entry 1 sense Webster, 1913 Inauspicious /ĭnˌ-ousˌ-pĭsh'-ĭs/ · In·aus·pi·cious · IPA /ˌɪnɔːˈspɪʃəs/ 01 a. Not auspicious; ill-omened; unfortunate; unlucky; unfavorable. 1. Not auspicious; ill-omened; unfortunate; unlucky; unfavorable.