不轨

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

他行为不轨, 败坏了学校的声。

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

孩的不轨行为,使他的母亲许多夜不得安眠。

Don't harbor unkind thoughts.

不要心不轨。

Their talk was slightly malicious.

他们的谈话有点儿心不轨。