This is the 1504th most frequent Korean word.
가득한
"Full of" or "filled with."
The word '가득한' is used to describe the state in which something, in this case warm sunlight, fills or occupies the room wholly and abundantly.
방안에 따뜻한 햇살이 가득하다.
The room is full of warm sunlight.
Here, '가득한' is used metaphorically to describe an abundant presence of affection conveyed through her smile.
그녀의 미소는 애정이 가득하다.
Her smile is filled with affection.
Here, '가득한' directly describes a bookshelf being completely filled with books.