THESAURUS
open to question
arguable, at issue, confutable, conjectural, contestable, controversial, controvertible, debatable, deniable, disputable, doubtable, doubtful, dubious, dubitable, iffy, in dispute, in doubt, in dubio, in question, mistakable, moot, open to doubt, problematic, questionable, refutable, speculative, suppositional, suspect, suspicious
