Say nay is a phrase that implies a refusal or a negative response. There are several synonyms for say nay, which can be used depending on the context. One of the popular synonyms for say nay is refuse, which is often used when denying a request or offer. Another synonym for say nay is reject, which suggests a stronger and firmer refusal. To express a dissenting opinion, object can be used instead of say nay. Repudiate and negate are also synonyms for say nay, which are more formal and emphasize the denial of something. In short, there are many synonyms for say nay, which can help to communicate a negative response effectively.