This is the 16113th most frequent Korean word.
불가능하다는
"Impossible"
'불가능하다는' is used as a determiner in this sentence, qualifying '것' which means 'the fact'.
그가 불가능하다는 것을 입증했어요.
He proved that it was impossible.
'불가능하다는' here describes '의견', showing a characteristic attributed to the opinions.
그 계획이 불가능하다는 의견이 많아요.
There are many opinions stating that the plan is impossible.
'불가능하다는' modifies '뜻,' conveying the negation of the concept of impossibility.