/ɪnˈdɪˌfiːzəbli/ – Adverb
Definition: Không thể bị hủy bỏ hoặc thay đổi.
A more thorough explanation: (of a right, payment, or other benefit) done in a way that makes it incapable of being taken away, overturned, or made invalid in any way
Example: All obligations have matured and have been indefeasibly repaid in full.