Translation of "Lousy" in Korean

I would explain why I think this is a lousy trick.

제 생각을 말씀 드릴게요, 왜 이게 바보 같은 마술인지.

It is lame, it is lousy, and it is selfish, and it still works."

실력도 없고, 게으르고, 이기적이지만, 여전히 일은 해."

I think it's a lousy trick because at its core, it's just a puzzle.

바보스러운 마술인 이유는 그 핵심 때문이거든요. 이건 단순한 퍼즐이예요.