Rebuff means to reject or refuse a proposal, request or offer in a cold or blunt manner. Synonyms for rebuff include decline, refuse, reject, spurn, dismiss, repudiate, snub, turn down, repulse, repel, veto, check, discourage, foil, frustrate, oppose, resist, and snipe. Each of these synonyms portrays a similar sentiment to rebuff but with varying degrees of intensity and tone. Refuse, for instance, conveys a more neutral tone than snub, which implies a deliberate act of disdain or disrespect. Furthermore, the choice of synonym depends on the context and the nature of the proposal or request being rejected.