The phrase "put one's mind to rest" means to find peace or resolution in a situation. The antonyms for this phrase could be "stressed," "anxious," "worried," or "bothered." These words suggest a lack of peace or resolution in a situation, and the inability to find comfort or satisfaction. Other antonyms could include "uncertain," "doubtful," "unsettled," or "confused." These words suggest a lack of clarity or certainty, and the inability to make a decision or find a solution. Overall, the antonyms for "put one's mind to rest" highlight the mental and emotional turmoil that can arise when one is unable to find peace or resolution in a situation.