noun
or im·permanency (ˈ)im+
Etymology: in- (I) + permanence, permanency
: the quality or state of being impermanent
the impermanence … of all the dear world of beauty — C.E.Montague
the sense of the impermanence of things, the transitoriness of life — Laurence Binyon
the foolishness of love and the impermanency of all human relationships — Lafcadio Hearn