Entry 1 sense Webster, 1913 Inappreciable · In·ap·pre·ci·a·ble · IPA /ˌɪnəˈpɹiːʃəbəl/ 01 a. Not appreciable; too small to be perceived; incapable of being duly valued or estimated. 1. Not appreciable; too small to be perceived; incapable of being duly valued or estimated.