There are many synonyms for the word "susceptible" that can be used to add variety to your writing. Some common synonyms include "vulnerable," "prone," "liable," "sensitive," and "open." These words all convey a sense of vulnerability or susceptibility to something, such as disease, harm, or persuasion. Other synonyms include "receptive," "impressionable," "suggestible," and "credulous," which underscore a tendency to be influenced or swayed by others. Importantly, using synonyms can help avoid repeating the same word over and over again, making your writing more engaging and interesting. Consider these synonyms when trying to communicate a sense of vulnerability or susceptibility in your writing.