Structure
けっこう + Phrase
Set Expressions:
けっこうだ
Details
Part of Speech
Adverb
Word Type
Ordinary
Register
Standard
About けっこう
結構 is a な-Adjective that is actually used more frequently as a sentence altering adverb, than it is as a な-Adjective. What this means is that it is regularly used before an entire phrase (without な or だ), and it will modify the entire sentence. The most common meaning that 結構 has is 'quite' (a bit/a lot).
Fun Fact
結構 is used very similarly in Japanese to 'no thank you', or 'I'm fine thanks' in English. For example, if someone asks you if you want to try a sample in a shop, most people would just say 結構です.
Related
Examples
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いいえ、けっこうです。
No thank you.
このカバンはけっこう高いです。
This bag is quite expensive.
それはけっこう面白いですね
That is quite interesting, isn't it.
私は、けっこうです。
No thank you. (I'm fine)
この公園はけっこう広いです。
This park is quite spacious.
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Online
Differences from ずいぶん、けっこう
Japanese Stack Exchange
Properties of Adverbs
Tae Kim
結構(けっこう)
Japanese Test 4 You
Offline
Genki I 2nd Edition
Page 146
Tae Kim's Japanese Grammar Guide
Page 78
Tobira
Page 145
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