Antonyms of adj agreed_upon

1 sense of agreed upon

Sense 1
agreed upon (predicate), stipulatory -- (constituted or contracted by stipulation or agreement; "stipulatory obligations")

INDIRECT (VIA uncontroversial) -> controversial -- (marked by or capable of arousing controversy; "the issue of the death penalty is highly controversial"; "Rushdie's controversial book"; "a controversial decision on affirmative action")

Similarity of adj agreed_upon

1 sense of agreed upon

Sense 1
agreed upon (predicate), stipulatory -- (constituted or contracted by stipulation or agreement; "stipulatory obligations")
       => uncontroversial (vs. controversial), noncontroversial -- (not likely to arouse controversy)