refutable

from WordNet (r) 3.0 (2006)

refutable
    adj 1: able to be refuted [syn: {questionable}, {refutable},
           {confutable}, {confutative}]

from The Collaborative International Dictionary of English v.0.48

Refutable \Re*fut"a*ble\ (r?*f?t"?*b'l;277), a. [Cf. F.
   r['e]futable.]
   Admitting of being refuted or disproved; capable of being
   proved false or erroneous.
   [1913 Webster]

from The Free On-line Dictionary of Computing (8 July 2008)

refutable

   In lazy functional languages, a refutable pattern is one which
   may fail to match.  An expression being matched against a
   refutable pattern is first evaluated to head normal form
   (which may fail to terminate) and then the top-level
   constructor of the result is compared with that of the
   pattern.  If they are the same then any arguments are matched
   against the pattern's arguments otherwise the match fails.

   An irrefutable pattern is one which always matches.  An
   attempt to evaluate any variable in the pattern forces the
   pattern to be matched as though it were refutable which may
   fail to match (resulting in an error) or fail to terminate.

   Patterns in Haskell are normally refutable but may be made
   irrefutable by prefixing them with a tilde (~).  For example,

   	(\ (x,y) -> 1) undefined	==>	undefined
   	(\ ~(x,y) -> 1) undefined	==>	1

   Patterns in Miranda are refutable, except for tuples which are
   irrefutable.  Thus

   	g [x] = 2
   	g undefined			==>	undefined

   	f (x,y) = 1
   	f undefined			==>	1

   Pattern bindings in local definitions are irrefutable in both
   languages:

   	h = 1 where [x] = undefined	==>	1
   Irrefutable patterns can be used to simulate unlifted products
   because they effectively ignore the top-level constructor of
   the expression being matched and consider only its components.

from Moby Thesaurus II by Grady Ward, 1.0

31 Moby Thesaurus words for "refutable":
      arguable, at issue, confutable, conjectural, contestable,
      controversial, controvertible, debatable, defeasible, deniable,
      disprovable, disputable, doubtable, doubtful, dubious, dubitable,
      iffy, in dispute, in doubt, in dubio, in question, mistakable,
      moot, open to doubt, open to question, problematic, questionable,
      speculative, suppositional, suspect, suspicious