結構 (けっこう, kekkou) Japanese meaning: splendid | KotomoraMeanings
構
な
お
庭
です
ね
。
This is a splendid garden, isn't it?
Thank you for the lovely gift.
Usage patterns
〈物・事〉は結構ですused to politely decline or say something is unnecessary
I'm fine without more tea, thank you.
〈動詞〉て結構ですit's fine / you may go ahead and ~
It's fine to just leave it as it is.
結構な〈物〉a splendid, fine ~
I received a lovely souvenir.
結構〈形容詞〉quite / fairly ~
This problem is quite difficult.
なかなか
N5
けっこう is a casual, everyday way to say 'quite/fairly', while なかなか carries a slightly more formal or admiring tone, especially in なかなかの〜 constructions.
結構 can mean 'quite/fairly' like 割と, but it also has separate meanings like 'fine' or 'enough' that 割と does not share.