1. rebuff. Refuse, decline, reject, spurn all imply nonacceptance of something. To decline is milder and more courteous than to refuse, which is direct and often emphatic in expressing determination not to accept what is offered or proposed: to refuse a bribe; to decline an invitation. To reject is even more positive and definite than refuse : to reject a suitor. To spurn is to reject with scorn: to spurn a bribe.