Source : Webster's Revised Unabridged Dictionary (1913)

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.

         Arguments . . . inconclusive and impertinent. --South.
   -- {In`con*clu"sive*ly}, adv. -- {In`con*clu"sive*ness}, n.

Source : WordNet®

inconclusive
     adj 1: not conclusive; not putting an end to doubt or question; "an
            inconclusive reply"; "inconclusive evidence"; "the
            inconclusive committee vote" [ant: {conclusive}]
     2: leading to no final results or outcome; "an inconclusive
        experiment"