The phrase "in jeopardy" refers to a state of danger, risk, or uncertainty. There are many synonyms that can be used to convey the same meaning, including "at risk," "in danger," "endangered," "vulnerable," "imperiled," "threatened," "precarious," and "insecure." Each of these words adds a slightly different nuance to the meaning of the phrase, but they all share the common theme of something being at risk or in peril. Whether describing a person, an idea, or a situation, using these synonyms for "in jeopardy" can help to add depth, insight, and urgency to your writing or speech.