The term 'with enthusiasm' can be expressed in many different ways. The crossword solutions AVIDLY (6 letters), EAGERLY (7 letters), KEENLY (6 letters), WILDLY (6 letters), HEARTILY (8 letters), FERVENTLY (9 letters) and LIKEAHOUSEAFIRE (15 letters) all describe the same concept of doing something with great passion and energy. AVIDLY implies a strong eagerness, while EAGERLY suggests an intense desire to do something. KEENLY implies a sharp focus and intensity, while WILDLY implies a more uncontrolled and passionate approach. HEARTILY implies a sincere and heartfelt effort, while FERVENTLY suggests a passionate and intense commitment. Finally, LIKEAHOUSEAFIRE implies an unstoppable and powerful force. All of these words capture the idea of doing something with enthusiasm.