Antonyms of adj three-way

1 sense of three-way

Sense 1
tripartite, three-party, three-way -- (involving three parties or elements; "a tripartite treaty"; "a tripartite division"; "a three-way playoff")

INDIRECT (VIA multilateral) -> unilateral, one-sided -- (involving only one part or side; "unilateral paralysis"; "a unilateral decision")

Similarity of adj three-way

1 sense of three-way

Sense 1
tripartite, three-party, three-way -- (involving three parties or elements; "a tripartite treaty"; "a tripartite division"; "a three-way playoff")
       => multilateral (vs. unilateral), many-sided -- (having many parts or sides)