indeterminable

from WordNet (r) 3.0 (2006)

indeterminable
    adj 1: not capable of being definitely decided or ascertained
           [syn: {indeterminable}, {undeterminable}] [ant:
           {determinable}]
    2: incapable of being definitely ascertained

from The Collaborative International Dictionary of English v.0.48

Indeterminable \In`de*ter"mi*na*ble\, a. [L. indeterminabilis:
   cf. F. ind['e]terminable. See {In-} not, and Determine.]
   Not determinable; impossible to be determined; not to be
   definitely known, ascertained, defined, or limited. --
   {In`de*ter"mi*na*bly}, adv.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Indeterminable \In`de*ter"mi*na*ble\, n.
   An indeterminable thing or quantity. --Sir T. Browne.
   [1913 Webster]

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