Counter-measures refer to actions or methods taken to prevent or mitigate a particular situation. The antonyms for counter-measures could be 'carelessness' or 'negligence' as they imply a lack of action or attention. Another antonym could be 'facilitation' which means to make something easier, rather than putting up barriers or roadblocks as counter-measures would do. Similarly, 'encouragement' is another antonym as it implies positive actions to support something, rather than taking measures to counter it. Overall, the antonyms for counter-measures are words that indicate a lack of action or positive support.