The antonyms for the word "un-regenerate" are regenerate, revitalize, rejuvenate, renew, heal and revive. Regenerate means to become anew or to grow again after being damaged or destroyed. Revitalize signifies to restore energy or vitality to something that has become weak or inactive. Rejuvenate refers to the process of renewing youthfulness, energy, or freshness. Renew means to restore or make new, while heal is to restore or repair damage or illness. Lastly, revive means to come back to life or to restore consciousness. Using these antonyms, we can express the opposite meaning of "un-regenerate" and describe something as refreshed, renewed, or restored.