The phrase "devil may care" is commonly used to describe someone who is reckless, carefree, and unconcerned about the consequences of their actions. Antonyms for this phrase would be responsible, cautious, and conscientious. A person who is responsible takes their actions seriously and considers the potential consequences. They are careful not to take unnecessary risks and consider the impact of their actions on others. A person who is cautious is careful and prudent, taking time to weigh all options before making a decision. Finally, a conscientious person is highly ethical and accountable, taking great care to ensure that their actions align with their values and principles.