fal·li·ble \ˈfaləbəl\adjective Etymology: Middle English, from Medieval Latin fallibilis, from Latin fallere to deceive + -ibilis -ible — more at fail 1.: liable to err < all men are fallible > 2.: liable to be erroneous or inaccurate < a fallible rule > • fal·li·ble·ness\-bəlnə̇s\noun-es • fal·li·bly\-blē, -li\adverb