na-adjective
Describes a young man who is stylish, spirited, and gallant, often with a slightly old-fashioned or Edo-period flavor. Commonly used in the phrase いなせな若者.
彼はいなせな着物姿で祭りに現れた。
He appeared at the festival in a dashing kimono.
あの俳優は若い頃、いなせな
That actor was popular as a dashing young leading man in his youth.
いき refers to refined, chic, or stylish taste, often with a sense of understated elegance, while いなせ emphasizes a more spirited, gallant, and youthful dash.
二枚目 means a handsome young man or a romantic lead, focusing on looks and role, whereas いなせ describes a dashing, stylish character and manner.
Said to derive from the name of a fish, 鯔 (ina, 'mullet'), combined with 背 (se, 'back'), referring to the sleek, stylish appearance of young fishmongers in Edo. The exact origin is uncertain, but it is associated with Edo-period culture.