This is the 16186th most frequent Korean word.
불투명이
"불투명이" means "opacity" or "impermeability to light."
In this sentence, '불투명' is used as an adjective describing the surface's property of not allowing light to pass through, making it not see-through.
그 물건의 표면은 불투명이라 안쪽이 보이지 않는다.
The surface of that item is opaque, so the inside cannot be seen.
Here, '불투명이' functions as a noun, referring to the characteristic of being opaque, utilized for a specific purpose.
불투명이의 특성을 활용해 창문의 프라이버시를 보호했다.
The opaque quality was utilized to protect the privacy of the window.
In this context, '불투명이' metaphorically indicates unclear or ambiguous communication, showing a non-literal usage of the term to describe something abstract.