There are several synonyms for the phrase "make feel less nervous." These synonyms include "calm," "soothe," "reassure," "comfort," "ease," "pacify," and "relax." When someone feels nervous, it can be helpful to use these synonyms to describe how to make them feel better. For example, you can say "I can tell you something that might soothe your nerves" or "I'm here to reassure you that everything will be okay." By using synonyms, you can communicate effectively and help alleviate nervousness in yourself or others.