arguable

from WordNet (r) 3.0 (2006)

arguable
    adj 1: capable of being supported by argument
    2: open to argument or debate; "that is a moot question" [syn:
       {arguable}, {debatable}, {disputable}, {moot}]

from The Collaborative International Dictionary of English v.0.48

Arguable \Ar"gu*a*ble\, a.
   Capable of being argued; admitting of debate.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

30 Moby Thesaurus words for "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, open to question,
      problematic, questionable, refutable, speculative, suppositional,
      suspect, suspicious, uncertain