Synonyms for the word "blood-stained" include "bloodied", "bloody", "sanguine", "crimson-stained", and "red-dyed". All of these words convey the idea of something being stained or colored in a deep, dark red, often as a result of violence or injury. They can be used to describe everything from clothing and fabric to a person's skin or environment. Whether used to evoke a sense of horror or to simply describe a visual scene, these words are powerful tools for writers looking to create vivid and impactful prose.