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isolationist (n.)

1899 in reference to U.S. foreign policy, "one who advocates a policy of non-participation in foreign affairs" (earlier in reference to treatment of leprosy), from isolation + -ist. As an adjective from 1920. Isolationism is attested in a general sense by 1902; in a U.S. geopolitical sense by 1919 in reference to opposition to joining the League of Nations.

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Definitions of isolationist from WordNet
1
isolationist (n.)
an advocate of isolationism in international affairs;
2
isolationist (adj.)
of or relating to isolationism;
Synonyms: isolationistic
From wordnet.princeton.edu