시무룩 means gloomy, sull, depressed sad. the most common example it's used with is 시무룩한 표정 a gloomy face. if people look l 왜 시무룩한 표정이야?ike they're having a bad day, and there face looks very gloomy then 왜 시무룩한 표정이야? why the sad face, what's wrong?