neb·u·los·i·ty \ˌ ̷ ̷ ̷ ̷ˈläsəd.ē, -ətē, -i\noun (-es) Etymology: French or Late Latin; French nébulosité, from Late Latin nebulositat-, nebulositas, from Latin nebulosus + -itat, -itas -ity 1.: the quality or state of being nebulous : cloudiness 2.: nebulous matter : nebula < faintly luminous nebulosity is abundant in the vicinity of Orion — R.H.Baker >