quick

The word quick means occurring with speed or without delay. It conveys the idea of something being done or occurring in a shorter amount of time than usual, often with an emphasis on efficiency or immediacy.

• She made a quick decision to leave her job. — 彼女は仕事を辞めるという素早い決断を下した。
• The quick response from the team helped save the situation. — チームの迅速な対応が事態を救った。

Quickly as an adverb means in a fast manner or with speed. It is often used to describe the manner in which an action is performed, highlighting efficiency and promptness.

• Please respond quickly to the invitation. — 招待状に素早く返事してください。
• He completed the task quickly and efficiently. — 彼はその仕事を迅速かつ効率的に終えた。