"On the critical list" is a phrase used to describe someone or something in a precarious state, requiring urgent attention and support. There are a number of synonyms that can be used to convey a similar sense of urgency and concern. "In dire need," "on the brink," "in a precarious position," "on life support," and "hanging by a thread" are just a few examples. Other options include "at risk," "in danger," "in jeopardy," "vulnerable," and "in extremis." When describing a situation that requires immediate action, these synonyms can help to emphasize the seriousness of the issue and the need for swift and decisive intervention.