Unbenignant is a word used to describe something that is not kind, helpful, or beneficial. While this word may not be familiar to everyone, there are plenty of synonyms that can be used in its place. Words like malevolent, malignant, harmful, and destructive all convey a similar meaning to unbenignant. Other options include unfavorable, hostile, unpropitious, and unkind. Each of these words paints a picture of something negative or harmful, and can be used in a variety of contexts. Whether you're describing a person's behavior or the impact of a situation, these synonyms will help you communicate your meaning clearly and effectively.