忽然 こつぜん Also written こつ然 Meanings たる-adjective, Adverb sudden; abrupt; unexpected Kanji 忽 in a moment; instantly; all of a sudden. Read as コツ. 然 -ly. Read as ゼン. Common phrases 忽然と姿を消す 忽然と消える Jinuma: Japanese Dictionary · Word lists