The expression "catches straws" means someone who is trying to find any possible solution or explanation, even if it is unlikely or unreliable. Antonyms for this phrase would include being confident, certain, and grounded in reality. Instead of grasping at straws, one could be resolute, assured, or convinced of the situation. Additionally, instead of being desperate or frantic to find a solution, an antonym could be to be patient, calm, and collected. So rather than feeling overwhelmed and searching for any solution, it's important to have confidence in reality and take a measured approach to problem-solving.