Definition of unreverence in English:
unreverence
verb (ˌ)ʌnˈrɛv(ə)r(ə)ns(ˌ)ʌnˈrɛv(ə)rəns
rare with object To treat without reverence or due respect.
Origin
Mid 16th century; earliest use found in John Bale (1495–1563), bishop of Ossory, evangelical polemicist, and historian. From un- + reverence.