shininess

adjective, shin·i·er, shin·i·est.

1. bright or glossy in appearance.
2. filled with light, as by sunshine.
3. rubbed or worn to a glossy smoothness, as clothes.

adjective shinier or shiniest

1. glossy or polished; bright
2. (of clothes or material) worn to a smooth and glossy state, as by continual rubbing

adj.1580s, from shine (n.) + -y (2). As a noun meaning “a shiny object” (also “money”) from 1856. Related: Shininess.