The phrase "on deathbed" is commonly used to describe the condition of an individual who is nearing the end of their life. However, there are several synonyms that can be used to describe this emotional and physical state. Some of the synonyms include "dying", "terminally ill", "in the last stages of life", "at the end of life", "on the brink of death", and "approaching the end". These synonyms are often used in medical contexts or when discussing the final stages of a person's life. Ultimately, the use of any synonym should be done with sensitivity and empathy towards the individual and their loved ones.