na-adjective
sudden; lightning-fast; shocking
Describes an event or change that happens with the speed and impact of an electric shock. Often used for news, developments, or actions that are abrupt and surprising.
電撃的な発表に会場がざわついた。
The sudden announcement caused a stir in the venue.
彼は電撃的に
He resigned with shocking suddenness.
衝撃的 focuses on the emotional shock; 電撃的 emphasizes the swiftness and surprise of the action itself.
From 電撃 (electric shock) + 的 (-like). The figurative sense of 'lightning-fast' or 'sudden' is a natural extension of the literal meaning.