우유부단해요 · 우유부단했어요 · 우유부단한 (+noun)
indecisive, wishy-washy
Example
그는 우유부단해서 메뉴 하나도 잘 못 골라요.
He's so indecisive he can't even pick one item off a menu.
Word parts
우 gentle+유 soft+부 not+단 decide
Literally 'soft and gentle, unable to cut' — too soft to make a decision.
Good to know
Nothing to do with 우유 'milk' — it's a four-character idiom.
Related words