Entry 1 sense Webster, 1913 Unfavorable /ŭnˌ-fāv'-ẽr-əb-əl/ · Un·fa·vor·a·ble · IPA /ˌʌnfˈeɪvərəbəl/ 01 a. Not favorable; not propitious; adverse; contrary; discouraging. 1. Not favorable; not propitious; adverse; contrary; discouraging.