不轨

His bad behaviour has tarnished the good name of the school.

他行为不轨, 败坏了声誉。

The boy’s misconduct cost his mother many sleepless nights.

这男孩不轨行为,使他母亲许多夜不得安眠。

Don't harbor unkind thoughts.

不要心不轨。

Their talk was slightly malicious.

他们谈话有点儿心不轨。