understaffed
adjective /ˌʌndəˈstɑːft/
  /ˌʌndərˈstæft/
[not usually before noun]- not having enough people working and therefore not able to function well人员不足;人手太少 - We’re very understaffed at the moment.我们此刻人手太少。 
 
- We’re very understaffed at the moment.