"he was never slow to express his dissatisfaction with the service he received"
1.不满;不悦
If you feeldissatisfaction with something, you are not contented or pleased with it.
dissatisfaction的解释
e.g. She has already expressed herdissatisfaction with this aspect of the policy...
她对政策的这一方面已经表达了不满。
e.g. Low pay is the main cause of jobdissatisfaction among teachers.
低薪是教师对工作不满的主要原因。
1. 不満:discrimination 差別 |dissatisfaction 不満 | dissolve 溶かす