튼튼하다

Meanings

strongVery hard and firm.
healthyOne's body, bones, teeth, etc., being hard, firm, and healthy.
stable; strongA group or an organization being stable and not easily collapsed,
strong; solidOne's ideology or mind not shaking and being certain.

Examples from Lessons (3)

꼼꼼한 계획 은 결국 즐거운 추억 을 만드는 튼튼한 밑거름 이 된다.
Meticulous planning ultimately becomes a solid foundation for creating enjoyable memories.
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접속어 는 글 의 뼈대 를 튼튼하게 잡아주는 역할 을 하므로 전략적으로 배치하는 훈련 이 필요합니다.
Because transitional words play the role of firmly holding the framework of a piece together, training in placing them strategically is necessary.
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학문적 수준 이 높은 에세이일수록 연결어는 글 을 하나 로 묶어 주는 튼튼한 밧줄 의 역할 을 합니다.
The higher the academic level of an essay, the more the connectors act as a sturdy rope that binds the writing together.
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Grammar in These Examples

-ㄴ/은Level 1Adjective noun modifier -게Level 3-ly (adverbial form)