Quick is a word that describes something that is done or happening fast or in a short amount of time. However, there are many synonyms you can use in your writing to make it more interesting and varied. Some words that can be used instead of quick are rapid, speedy, swift, brisk, instantaneous, expeditious, hasty, fleet, fleeting, and prompt. These words can be used interchangeably with quick depending on the context of the sentence, adding flavor and clarity to your writing. It is important to choose the right synonym for the tone and meaning you want to convey; using different words will make your writing sound more engaging and exciting.