wistful

物憂げな表情

describes a look on someone's face showing a sad longing for the past

過去への悲しい憧れを示す顔の表情を説明する

物憂げなため息

describes a sound made that indicates sad longing

悲しい憧れを示す音を説明する

a feeling of sad desire for something in the past

a sad but pleasant feeling of remembering the past

物悲しい憧れ

a strong feeling of sad longing, especially for something unattainable

過去の何かに対する優しく、悲しい切望の感情