とつぜん
abruptly, suddenly
He was walking beside you, and then he was forty yards up the road. No toots とつ, no warning, nothing: とつぜん.
The written and formal one. いきなり is the abrupt spoken version, 急に きゅうに is a state changing fast. Shares its 然 with 全然 and 当然.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.