nothingarian
/ˌnʌθɪŋˈɛːrɪən/ /ˌnʌθɪŋˈɡɛːrɪən/originally US. Now chiefly historical
noun
A person who has no (clear) religious belief or political affiliation.
adjective
Of or relating to people who hold no religious belief or political affiliation; having no definite aim or purpose. Now rare.
Origin
Late 18th century; earliest use found in Jonathan Boucher (1738–1804), schoolmaster and Church of England clergyman. From nothing noun + -arian.