Entry 1 sense Webster, 1913 Imaginable /ĭmˌ-ăj'-ən-əb-əl/ · Im·ag·i·na·ble · IPA /ɪˈmæd͡ʒɪnəbəl/ 01 a. Capable of being imagined; conceivable. 1. Capable of being imagined; conceivable. “Men sunk into the greatest darkness imaginable.” — Tillotson.