Being sane about something is a good antonym for being crazy for it. To be level-headed and reasonable, it's important to focus on the task or situation at hand without becoming overly obsessed or irrational. Another antonym for being crazy for something might be disinterested or apathetic. These two words imply a lack of enthusiasm or passion, which is the opposite of being crazy for something. Additionally, being indifferent suggests a lack of concern, detachment or impartiality. It's important to have balance in our emotions and reactions. Therefore, we should avoid being crazy for anything, and strive for a positive, rational and level-headed approach in all areas of our lives.