The Collaborative International Dictionary of English v.0.48:

Dissatisfactory \Dis*sat`is*fac"to*ry\, a.
   Causing dissatisfaction; unable to give content;
   unsatisfactory; displeasing.
   [1913 Webster]

         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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dissatisfactory
    adj 1: not up to expectations; "a disappointing performance from
           one who had seemed so promising" [syn: disappointing,
           dissatisfactory, unsatisfying]