isolationist /(ī`sō̇*lā"shŭn*ĭst)/

i·so·la·tion·ist

isolationist

n.
  1. A proponent or supporter of isolationism; one who is isolationistic.

isolationist

adj.
  1. of or pertaining to isolationism.
  2. Favoring or supporting isolationism; -- of people.