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considerably; fairly; quite; rather; pretty
仕事が忙しくてかなり疲れが溜まっている。
Work has been busy, and I'm quite tired.
かなり寒くなってきたね。
It's gotten quite cold, hasn't it?
この辺りは最近かなり開発が進んで風景が変わった。
This area has been developed quite a lot recently and the scenery has changed.