The word "ruder" is often used to describe someone who is impolite or discourteous. However, there are many synonyms that can be used to convey the same meaning. Some of these include "crude," "uncivil," "gruff," "abrupt," "boorish," "blunt," "insolent," "impolite," "discourteous," "brazen," "inconsiderate," "ungracious," "offensive," "disrespectful," "rude," and "uncouth." These words can be used interchangeably to describe someone who behaves in an impolite or disrespectful manner. Whether you're writing a formal piece or simply looking for a more fitting way to describe someone's behavior, these synonyms can help you better convey your meaning.