Antonyms of adv unilaterally

1 sense of unilaterally

Sense 1
unilaterally, one-sidedly -- (in a unilateral manner; by means of one part or party; "they worked out an agreement unilaterally")
       Antonym of multilaterally (Sense 1)
      => multilaterally -- (in a multilateral manner;so as to affect many parties or governments; "they worked out an agreement unilaterally")

Synonyms of adv unilaterally

1 sense of unilaterally

Sense 1
unilaterally, one-sidedly -- (in a unilateral manner; by means of one part or party; "they worked out an agreement unilaterally")