The term 'most earth shaking' refers to something that is powerful and has significant impact. Antonyms for this phrase could include 'insignificant', 'unimportant', 'irrelevant', 'trivial', 'ordinary', or 'commonplace'. These words indicate that something is not noteworthy or lacks any major impact. Another antonym could be 'calm' or 'peaceful', indicating a lack of disturbance or disruption. These words are often used to describe the opposite of something that is powerful or impactful. Considering these antonyms, it becomes clear that the phrase 'most earth shaking' has a strong connotation, and the opposite meanings show a stark contrast to its intensity.