The phrase "more earth-shattering" implies big and significant events or moments. Antonyms for this phrase can include words like insignificant, trivial, unimportant, or inconsequential. These words all suggest events or moments that are small in importance or impact. Other antonyms for "more earth-shattering" could be peaceful, tranquil, or calm, which imply the absence of significant or impactful events. Instead, these words suggest a state of being that is quiet, undisturbed, and generally free of major changes or upheavals. Whatever the antonym, using it in a sentence can help to create a contrasting effect to the strong impact and intensity that the original phrase conveys.