—n. 1. swiftness of motion; speed; celerity: He performed his task with great haste. They felt the need for haste. 2. urgent need of quick action; a hurry or rush: to be in haste to get ahead in the world. 3. unnecessarily quick action; thoughtless, rash, or undue speed: Haste makes waste. 4. make haste, to act or go with speed; hurry: She made haste to tell the president the good news.