This is the 19307th most frequent Korean word.
않을뿐더러
"Not only does/will not."
In this sentence, "않을뿐더러" is used to convey an additive negation, emphasizing the continuation of negative qualities.
그 사람은 친절하지 않을뿐더러 예의도 없다.
That person is not only unkind but also lacks manners.
"않을뿐더러" in this context signifies that an initial negative aspect (lack of interest) is followed by an additional negative aspect (excessive duration).
영화가 재미가 없을뿐더러 너무 길었다.
The movie was not interesting and was too long.
Here, "않을뿐더러" connects two negative clauses about the person's actions, implying a compounded lack.