in·de·fea·si·ble \| ̷ ̷ ̷ ̷|fēzəbəl\adjective Etymology:in- (I) + defeasible : not defeasible : not capable of or not liable to being annulled or voided or undone : that cannot be forfeited < an indefeasible right to freedom > < an indefeasible claim to the title > — compare inalienable • in·de·fea·si·bly\-blē, -li\adverb