Overly enthusiastic is a term used to describe someone who is excessively passionate or excited about something. This can be seen in the crossword solutions for the term, such as 'RABID' (5 letters), which means having or proceeding from an extreme or FANATICAL support of or belief in something; 'GAGA' (4 letters), which is an informal term for being overly enthusiastic; 'FANATICAL' (9 letters), which means having an extreme and unreasoning enthusiasm of devotion; 'gungho' (6 letters), which is an informal term for being very eager and enthusiastic; and 'rahrah' (6 letters), which is an informal term for being overly enthusiastic and supportive.