Source : Webster's Revised Unabridged Dictionary (1913)

Dissatisfactory \Dis*sat`is*fac"to*ry\, a.
   Causing dissatisfaction; unable to give content;
   unsatisfactory; displeasing.

         To have reduced the different qualifications in the
         different States to one uniform rule, would probably
         have been as dissatisfactory to some of the States, as
         difficult for the Convention.            --A. Hamilton.
   -- {Dis*sat`is*fac"to*ri*ness}, n.

Source : WordNet®

dissatisfactory
     adj : not up to expectations; "a disappointing performance from
           one who had seemed so promising" [syn: {disappointing},
            {unsatisfying}]