개탄해요 · 개탄했어요 · 개탄할 거예요 · 개탄하세요
to deplore, to lament (a social situation)
Example
많은 전문가들이 정치인들의 무책임한 태도를 개탄했습니다.
Many experts deplored the irresponsible attitude of politicians.
Word parts
개 indignant+탄 sigh
Literally 'sigh with indignation' — used for public wrongs and the state of society.
Good to know
Mostly in news and formal writing, often as 개탄스럽다 (deplorable) or 개탄할 일이다.