If you say that someone does something with impunity, you disapprove of the fact that they are not punished for doing something bad.
例句
Mr Cook said future aggressors would be able to act with impunity if the objectives of the UN weren't met...库克先生说如果联合国的目标无法达成,那么将来的侵略者就可能会逃脱惩罚。These gangs operate with apparent impunity.这些团伙明目张胆地活动,却不受任何惩罚。