arbitrary

/ˈɑrbɪˌtrɛri/

based on or subject to individual discretion or preference or sometimes impulse or caprice

Chinese meaning: 任意的；武断的；专制的

The teacher's grading seemed arbitrary, with no clear criteria for high marks.

老师的评分似乎很随意，没有明确的高分标准。

An arbitrary decision by the manager led to confusion among the staff.

经理的武断决定导致了员工间的混乱。