Here's what rhymes with unilateralist.

Consider these alternatives

unilateralism / given isolationist / conservationist imperialistic / characteristic moralistic / characteristic neoconservative / conservative wrongheaded / longheaded adventurism / given isolationism / given permissive / wishes hegemonic / chronic doctrinaire / their puritanical / mechanical steroidal / colloidal expansionary / very shortsighted / decided