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 for controversial and words similar to it.
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.