Sharpish is an expression that means to do something quickly or pronto. Some of the synonyms for sharpish include promptly, immediately, hastily, quickly, rapidly, and swiftly. Other alternatives for the word include speedily, expeditiously, briskly, posthaste, pronto, swiftly, fleetly, and lickety-split. These words share the same meaning and indicate a sense of urgency or hastiness. Sharpish is an informal term that works well in casual conversations, and using synonyms can help to add variety and flair to your language. By mastering the use of synonyms, you can make your language sound more engaging and captivating.