noun. The state or quality of being plain

noun. The quality or state of being plain.

noun. The condition of being plain (in all senses)

noun. The product or result of being plain

noun. the state of being unmixed with other material

noun. clarity as a consequence of being perspicuous

noun. an appearance that is not attractive or beautiful

noun. the appearance of being plain and unpretentious

"There are two differing roots for this term: Some claim it refers to the plainness of vanilla ice cream as opposed to those who like more adventurous flavors; others believe it comes from techno-culture, where a “vanilla” PC means a very basic machine, without bells and whistles."

appearance  clarity  clearness  limpidity  lucidity  

boldness  brevity  candour  celerity  cheerfulness  

Atticism  Bohemianism  accessibility  affability  apparentness  

plain