Controversial synonyms such as awkward, arguable, and at issue. Controversial is an adjective, and its antonyms are uncontroversial and anodyne. Additionally, here are 20 synonyms, related words, and verbs for controversial.
arguable, at issue, awkward, contended, contentious, controvertible, debatable, delicate, difficult, disputable, disputed, emotive, moot, open to discussion/question, problematic, sensitive, tendentious, under discussion, and vexed.