disappointing, below expectation, inadequate, displeasing, undesirable, regrettable, disconcerting, disquieting, vexing, distressing, upsetting, disturbing, offensive, unacceptable, disagreeable, unwelcome, shocking, deficient; see also poor 2.
Antonyms excellent*, satisfactory, gratifying.
"unsatisfactory." YourDictionary, n.d. Web. 16 August 2018. <http://thesaurus.yourdictionary.com/unsatisfactory>.
unsatisfactory. (n.d.). Retrieved August 16th, 2018, from http://thesaurus.yourdictionary.com/unsatisfactory
Below a standard of quality:
Tending to discourage, retard, or make more difficult: