When it comes to describing something that is extremely crushing or distressing, writers and speakers often rely on synonyms to infuse variety into their language. Some synonyms for the phrase "most bone crushing" include "devastating," "heart-wrenching," "soul-crushing," "agonizing," "traumatic," "pulverizing," "shattering," "demoralizing," and "overwhelming." Each word has its own unique connotations, but all capture the same sense of deep and unrelenting pain. These synonyms can be useful for writers looking to add depth and texture to their descriptions, or for speakers hoping to add emotional weight to their speeches or conversations.