C1 adjective /ʌnˈsɜːrvɪsəbəl/
Unserviceable
无法使用的; 有缺陷的
Meaning
not in working order; unable to be used; defective
Example
The old computer became unserviceable after the system crash.
那台旧电脑在系统崩溃后变得无法使用。