Antonyms of adj two-way

3 senses of two-way

Sense 1
bipartisan, bipartizan, two-party, two-way -- (supported by both sides; "a two-way treaty")

INDIRECT (VIA nonpartisan) -> partisan, partizan -- (devoted to a cause or party)

Sense 2
bipartite, two-part, two-way -- (involving two parts or elements; "a bipartite document"; "a two-way treaty")

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

Sense 3
two-way -- (operating or permitting operation in either of two opposite directions; "a two-way valve"; "two-way traffic"; "two-way streets")

INDIRECT (VIA bidirectional) -> unidirectional -- (operating or moving or allowing movement in one direction only; "a unidirectional flow"; "a unidirectional antenna"; "a unidirectional approach to a problem")

Similarity of adj two-way

3 senses of two-way

Sense 1
bipartisan, bipartizan, two-party, two-way -- (supported by both sides; "a two-way treaty")
       => nonpartisan (vs. partisan), nonpartizan -- (free from party affiliation or bias)

Sense 2
bipartite, two-part, two-way -- (involving two parts or elements; "a bipartite document"; "a two-way treaty")
       => multilateral (vs. unilateral), many-sided -- (having many parts or sides)

Sense 3
two-way -- (operating or permitting operation in either of two opposite directions; "a two-way valve"; "two-way traffic"; "two-way streets")
       => bidirectional (vs. unidirectional) -- (reactive or functioning or allowing movement in two usually opposite directions)