即そっ興きょう

noun which may take the genitive case particle 'no'

improvised; impromptu; ad-lib

Describes something done or made on the spot without planning; often used as a prenominal modifier (即興の〜).

• 即そっ興きょうのスピーチを頼たのまれた。

  I was asked to give an impromptu speech.