1.It was a careless action rather than a calculated one.
这是一次轻率的而不是有计划的行动。
2.Embarking on a relationship with these delicate creatures you need to know that the slightest careless action can wound them deeply.
跟这种纤细的生物交往,必须知道极小的疏忽也会让他们受创极深。