Unbenign is an adjective that refers to something that is harmful, unfavorable, or unkind. Synonyms for this word include malevolent, detrimental, maleficent, and malign. Malevolent implies a deliberate intention to harm, while detrimental suggests that something has a harmful impact on one's well-being or progress. Maleficent is similar to malevolent, but specifically refers to causing evil or harm through supernatural means. Malign is also synonymous with malevolent and is commonly used to describe a cancerous growth or tumor. Other synonyms for unbenign include inimical, hostile, unfavorable, and harmful. All of these words describe something that poses a threat or danger to individuals or groups.