The term 'extremely exciting' can be described using four different crossword solutions: HEADY (5 letters), ELECTRIFYING (12 letters), heartpounding (13 letters), and heartstopping (13 letters). HEADY is an adjective that means stimulating or exhilarating, while ELECTRIFYING is an adjective that means thrilling or exciting. Heartpounding and heartstopping are both adjectives that describe something that is so exciting that it causes one's heart to race or stop. All of these words together describe an experience that is incredibly exciting and stimulating.