プログレッシブ和英中辞典(第３版)の解説
こつぜん【×忽然】
忽然と (して)｜〔突如〕suddenly, abruptly; 〔思いがけず〕unexpectedly
- 彼は忽然と現れ，忽然と去った
He disappeared as suddenly as he had appeared. - 彼女は忽然と姿を現した
She appeared unexpectedly.