야심이 · 야심을
ambition (often ruthless)
Example
그는 대통령이 되겠다는 야심을 숨기지 않았어요.
He didn't hide his ambition to become president.
Word parts
야 wild+심 heart
Literally 'wild heart' — ambition that can't be tamed.
Good to know
야심 can sound scheming, but 야심 차다 / 야심작 ('ambitious work') are positive.
Related words