When someone behaves unpleasantly or ungraciously, we may use the expression "with bad grace." However, there are several other synonyms that can be used to convey a similar meaning. For example, we may say that someone is acting sourly, sour-faced, or sullenly. Alternatively, we might use words like begrudgingly, reluctantly, or resentfully to describe someone's manner. Other synonyms for "with bad grace" might include petulantly, peevishly, or even churlishly. Ultimately, any of these terms can be used to describe someone who is showing unpleasant or negative behavior, particularly in a social or communicative setting where grace and civility are expected.