迅速に

promptly

→ 迅速だ
phrase Rare #39,149
promptly A formal expression meaning to do something quickly and without delay; commonly used in business and official contexts.
JA: 問題が起きたら、迅速にご連絡ください。
EN: Please contact us promptly if a problem occurs.

貴社からのどんなご注文にも迅速に対処します

We will promptly handle any order from your company.

彼はその事態迅速に対応した

He responded quickly to the situation.