Sitting duck is a phrase that is commonly used to describe someone who is helpless and vulnerable, and is exposed to danger or attack. Fortunately, there are several synonyms that can be used in place of the term sitting duck. These include easy target, vulnerable prey, soft target, exposed victim, helpless pawn, and open game. These synonyms highlight how the subject is easily accessible and susceptible to attack, in different ways. Using these synonyms not only diversifies your language, but it also minimizes repetition of words, and allows you to paint a more vivid picture of what is taking place.