su·per·e·rog·a·to·ry 
(s′pər-ĭ-rŏgə-tôr′ē) also su·per·e·rog·a·tive (-tĭv)
(s′pər-ĭ-rŏgə-tôr′ē) also su·per·e·rog·a·tive (-tĭv)adj.
1. Performed or observed beyond the required or expected degree.
2. Superfluous; unnecessary: "It was supererogatory for her to gloat" (Mary McCarthy).