ungenerous       
adjective uk/ʌnˈdʒen.ər.əs/ us/ʌnˈdʒen.ər.əs/
 吝啬的,不大方的,不慷慨的
not willing to give money, help, kindness, praise, etc. to other people, or only willing to give a little
  an ungenerous welfare benefits system 一个并不宽松的福利制度  
It is not being ungenerous to the team to suggest that it, too, has many weak points. 说这个团队也有很多弱点,并非是对团队求全责备。 
 Opposite: generous
 - More examples
- The account pays an ungenerous 0.5% rate of interest.
- He clearly had a passion for music, so why was he such an ungenerous critic?
- There is a saying that a rich man who is ungenerous is like a tree without fruit.
- The article attempts to explain why we have in recent years become so ungenerous to migrants and refugees.