我对此事知之不详，不敢武断。

I don't know the details so I don't dare make an arbitrary decision.

武断的结论

arbitrary conclusion

武断地决定一切

decide everything arbitrarily

采取武断态度

adopt an arbitrary attitude

对任何问题都不容许采取武断态度。

An arbitrary stance should not be taken for any issue.

他的论点异常武断。

His argument is extremely arbitrary.

批评要防止主观武断。

In criticism, one must guard against subjectivism and arbitrariness.

说话不能这样武断。

You can't speak so arbitrarily.

武断乡曲

use one's power to tyrannize the people