When it comes to describing the feeling of being on the edge, there are many synonyms that can be used to portray this intense emotion. Some of the most common synonyms include being on the brink, on the verge, at the cusp, and on the threshold. Other words that can be used include being on the precipice, on the brink of collapse, on the razor's edge, and in a perilous state. Whether it's describing a physical or emotional state, these synonyms all convey the message that one is walking a fine line between safety and danger, and that any misstep could lead to catastrophic consequences.