The antonyms for the word "most nadir" are the highest point, zenith, peak, apex, climax, acme, summit, and top. These words describe the exact opposite of nadir, which refers to the lowest point of something. These antonyms are often used to describe moments of success, achievements, or excellence. For example, "the team reached the zenith of their careers after winning the championship game," or "her academic performance reached its apex during her final year of college." Contrasting words are helpful in expressing the full range of emotions, experiences, and ideas.