(1)非常に楽しいさまの
(2)楽しい方法で
(3)楽しい態度で
(4)in an enjoyable manner
さらに詳しく
(1)楽観主義で
(2)楽観的な態度で
(3)with optimism
(4)with optimism; in an optimistic manner; "`We have a good chance of winning,' he exclaimed optimistically"