nonmainstream

/nɑnˈmeɪnstriːm/
adjective
  1. Not belonging to or accepted by the most popular or widely accepted group, style, or culture.
    • She prefers nonmainstream music that you rarely hear on the radio.
    • The film festival showcases nonmainstream movies from independent directors.
    • His nonmainstream ideas about education are gaining some attention.
Antonyms
What does "nonmainstream" mean? | whatsthatwordmean | whatsthatwordmean