Overzealous is an adjective that describes someone who is excessively enthusiastic or passionate about something. It is often used to describe someone who is overly eager or passionate in a way that can be seen as excessive or inappropriate. The term is derived from the word 'ZEAL, ' which means great enthusiasm or passion. The crossword solution for overzealous is 'RABID, ' which is another adjective that describes someone who is excessively enthusiastic or passionate. RABID is often used to describe someone who is overly eager or passionate in a way that can be seen as extreme or irrational.