imponderable

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im·pon·der·a·ble / imˈpändərəbəl/ • n. a factor that is difficult or impossible to estimate or assess: there are too many imponderables for an overall prediction.• adj. 1. difficult or impossible to estimate, assess, or answer: an imponderable problem of metaphysics.2. archaic or poetic/lit. very light.DERIVATIVES: im·pon·der·a·bil·i·ty / -ˌpändərəˈbilitē/ n.im·pon·der·a·bly / -blē/ adv.