The phrase "shattered nerves" describes an intense emotional or physical state of being overwhelmed, frazzled, or depleted. Synonyms for "shattered nerves" include discombobulated, flustered, stressed, fatigued, worn-out, drained, frazzled, and exhausted. These terms express different degrees and aspects of the same feeling, ranging from a general sense of unease to a complete breakdown. Depending on the context, one may use a more specific synonym to convey a particular nuance or tone. For example, "discombobulated" suggests a lack of coherence, "fatigued" implies a physical and mental burden, while "worn-out" suggests a gradual depletion of energy over time. Whatever the synonym, "shattered nerves" conveys a sense of profound and lasting impact.