ADJECTIVE (1)

1. not conclusive; not putting an end to doubt or question;
- Example: "an inconclusive reply"
- Example: "inconclusive evidence"
- Example: "the inconclusive committee vote"

The Collaborative International Dictionary of English v.0.48:

Inconclusive \In`con*clu"sive\, a.
   Not conclusive; leading to no conclusion; not closing or
   settling a point in debate, or a doubtful question; as,
   evidence is inconclusive when it does not exhibit the truth
   of a disputed case in such a manner as to satisfy the mind,
   and put an end to debate or doubt.
   [1913 Webster]

         Arguments . . . inconclusive and impertinent. --South.
   -- In`con*clu"sive*ly, adv. -- In`con*clu"sive*ness, n.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

71 Moby Thesaurus words for "inconclusive":
   absonant, contradictory, contrary to reason, fallacious, faulty,
   feeble, flawed, flimsy, groundless, illogical, inauthentic,
   incongruous, inconsequent, inconsequential, inconsistent,
   indecisive, indefinite, indeterminate, insubstantial, invalid,
   irrational, loose, nonscientific, not following, not proved, open,
   paralogical, poor, reasonless, self-annulling, self-contradictory,
   self-refuting, senseless, unascertained, unattested, unauthentic,
   unauthenticated, uncertain, uncertified, unconfirmed, unconnected,
   uncorroborated, undemonstrated, undetermined, unestablished,
   unfinished, unfixed, unfounded, unphilosophical, unproved,
   unproven, unreasonable, unresolved, unrigorous, unscientific,
   unsettled, unshown, unsound, unsubstantial, unsubstantiated,
   unsupported, unsupported by evidence, unsustained, untested,
   untried, unvalidated, unverified, weak, without basis,
   without grounds, without reason