unilateral

adj. occurring on or affecting only one side; one-sided; performed by one side

Unilateralism, ("one+side-ism") is any doctrine or agenda that supports one-sided action. Such action may be in disregard for other parties, or as an expression of a commitment toward a direction which other parties may find agreeable. Unilateralism is a neologism, (used in all countries) coined to be an antonym for multilateralism —the doctrine which asserts the benefits of participation from as many parties as possible.
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Adjective
1. involving only one part or side; "unilateral paralysis"; "a unilateral decision"
(synonym) one-sided
(antonym) multilateral, many-sided
(similar) one-party
2. tracing descent from either the paternal or the maternal line only
(synonym) unilateralist
(similar) lineal, direct

adj. one sided, unilateral

adj. one sided, unilateral