Illnatured is a term that is used to describe someone who is generally unpleasant and unpleasant to be around. There are several synonyms for this word that can help to provide a more nuanced and descriptive understanding of this type of personality. Some of the most commonly used synonyms for illnatured include unkind, nasty, mean-spirited, malicious, spiteful, and vindictive. These words all suggest a type of hostility or animosity that is directed towards others and can make social interactions difficult and uncomfortable. When dealing with an illnatured person, it is important to remain calm and understand that their behavior is often driven by their own insecurities and fears.