"단어 공부를 하자니 막막하고",

Question

"단어 공부를 하자니 막막하고">,

Answer

I'd say it means "I thought about studying vocabulary, but I'd feel lost and helpless with it". 

요리를 하자니 귀찮고, 나가서 사먹자니 그것도 귀찮다. I thought about cooking but I can't be bothered to cook, and I can't be bothered to go out for breakfast/lunch/dinner either. 

-자니 is colloquial Korean and doesn't translate comfortably into English.

Answer

1.막막하다=I don't know= 막막하다
2.단어공부를 하려니 잘모르겠다-I don't know what  I 'll study English vocabulary .

Answer

1.막막하다=I don't know= 막막하다
2.단어공부를 하려니 잘모르겠다-I don't know what  I 'll study English vocabulary .