"To pieces" is commonly used to describe something that is completely destroyed or broken into small fragments. Synonyms for this phrase can be "shattered," "smashed," "fractured," "splintered," "crushed," "dismantled," "demolished," "ruined," "disintegrated," "torn apart," "scattered," "burst," "obliterated," "annihilated," "pulverized," or "broken down." These synonyms can help to diversify your vocabulary and add more descriptive language to your writing or speech. So, use these synonyms to add depth and a vivid description to your conversation or writing when you need to convey the sense of something being completely destroyed.