효과적

효과적

Effective.

Here, '효과적' is used to describe the method ('방법') as being effective or producing the desired result. It functions as an adjective.

이 방법은 매우 효과적입니다.

This method is very effective.

In this case, '효과적' is part of the adverbial form '효과적으로', describing how the speech was communicated ('전달되었습니다').

그의 연설은 청중에게 효과적으로 전달되었습니다.

His speech was effectively communicated to the audience.

Here, '효과적인' is an adjective modifying '대책' (plan), indicating that the plan should produce desired results or be efficient.

효과적인 대책을 생각해야 합니다.

We need to think of an effective plan.