結構

1. Origins, structure, and basic meaning

• Structure: 結構 (けっこう) has distinct contextual uses, including the degree adverb “quite” and the response “that is enough, thank you.”
• Basic usage: It can intensify an adjective or politely decline an additional offer.

2. Common pitfalls and similar expressions

• “Quite” versus “no, thank you”
  • 結構美しい evaluates a high degree, while 結構です can signal that the speaker needs no more; context prevents confusion.