なかなか
Usage
The adverb なかなか is synonymous with 結構. The major difference is that なかなか is not usually used with adjectives and adverbs with negative meanings. Note that なかなか also indicates that the speaker is impressed by the way something/someone or someone or the way someone does something.
Examples
この携帯電話のコマーシャルはなかなか面白い。犬が話すのがとても可愛い。
This smartphone commercial is very funny. The way the dog talks is very cute.
この間の旅行はなかなか楽しかった。泊まったホテルもなかなか良かったし、料理も結構美味しかった。
The trip the other day was quite fun to me. The hotel I stayed at was very good and the food was pretty good.