The word "most rockbottom" implies the lowest point or the extreme level of despair or failure. The antonyms for this phrase can be "highest peak," "topmost," "zenith," "culmination," or "apex." These words indicate success, achievement, and a sense of accomplishment. When someone reaches the highest peak of their career or personal life, it means they have succeeded and accomplished the goals they set out to achieve. Similarly, the term "zenith" refers to the pinnacle of success or the highest point in someone's life. Therefore, antonyms for the word "most rockbottom" represent a contrasting and optimistic perspective that signals hope, achievement, and success.