open to question

29 Moby Thesaurus words for "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