If you describe something as unsatisfactory, you mean that it is not as good as it should be, and cannot be considered acceptable.
例句
The inspectors said just under a third of lessons were unsatisfactory...督察員說只有不到1/3的課程不夠好。He asked a few more questions, to which he received unsatisfactory answers.他又問了幾個問題，得到的答案都不令人滿意。
英漢詞典釋義
adj.
使人不滿意的
Shops are often reluctant to take back unsatisfactory goods.商店一般都不愿收回顧客不稱心的貨物。The student’s work was judged unsatisfactory.這個學生的作業被認為是不能令人滿意的。
英英詞典釋義
Adjective
1. not giving satisfaction;
"shops should take back unsatisfactory goods""her performance proved to be unsatisfactory""life is becoming increasingly unsatifactory""our discussion was very unsatisfactory"