막연히 + verb (막연히 생각하다/기대하다)
vaguely, without a clear idea
Example
어릴 때는 막연히 의사가 되고 싶었어요.
When I was young, I vaguely wanted to become a doctor.
Word parts
막 vast, vague+연 so, -ly
Literally 'desert-like': vast and hazy, with no clear outline.
Related words