못해요 · 못했어요 · 못할 거예요 · 못한 (+noun)
to be bad at, to be unable to do; to be worse than
Example
저는 수영을 못해서 바다가 좀 무서워요.
I can't swim, so the ocean scares me a little.
Word parts
못 (can't) + 하다 (to do); the opposite of 잘하다.
Good to know
Pronounced [모태요] for 못해요: ㅅ sounds like ㄷ, then ㄷ+ㅎ becomes ㅌ.
Related words