The antonyms for the phrase 'going stale' are 'fresh,' 'new,' 'vibrant,' 'lively,' 'dynamic,' and 'up-to-date.' These words indicate the opposite of becoming stagnant or stale. For instance, a fresh idea or a new approach can revitalize a dull project, while a vibrant attitude can infuse new energy into a stagnant workplace. Similarly, staying up-to-date with the latest trends and technologies can help one remain dynamic and relevant in their field. In conclusion, using antonyms such as fresh, new, vibrant, lively, dynamic, and up-to-date helps bring a sense of excitement and innovation to any setting.