There are many alternative ways to say "no" depending on the situation and the level of formality required. Some common synonyms include "decline," "refuse," "deny," "reject," "rebuff," and "repudiate." For a more gentle approach, one could use "regretfully decline," "politely refuse," or "apologize, but can't." Another option is to redirect the conversation by saying "I'd rather not," "let's discuss this later," or "maybe another time." In some cases, a more assertive approach may be needed, such as saying "absolutely not," "not under any circumstance," or simply "no way." It is important to choose a phrase that accurately conveys your message while also being respectful.