The crossword solution for the term 'ZEALOUSNESS PLUS' is MANIA, which is a five-letter word. MANIA is a state of intense excitement and enthusiasm, often characterized by frenzied or abnormal behavior. It is usually associated with mental illness, but can also be used to describe an intense passion or enthusiasm for something. MANIA is often seen as a symptom of bipolar disorder, but it can also be caused by other conditions such as depression, anxiety, and substance abuse.