The term INTENSELY ENTHUSIASTIC can be summarized by two crossword solutions: ARDENT (6 letters) and GAGA (4 letters). ARDENT is an adjective meaning 'showing or characterized by strong enthusiasm or devotion'. It is derived from the Latin ardere, meaning 'to burn'. GAGA is an informal term used to describe someone who is intensely enthusiastic or passionate about something. It is often used to describe fans of a particular celebrity or artist.