To render insensible means to cause someone to lose consciousness or become numb and unresponsive. There are several synonyms for this phrase that convey a similar meaning, such as knock out, stun, anaesthetize, sedate, and desensitize. These terms are often used in medical contexts to describe the effects of anesthesia or medication on the body. In other cases, they may refer to the use of force or violence to incapacitate an individual. Regardless of the context, the synonyms for render insensible all indicate a loss of consciousness or sensation, often for therapeutic or practical purposes.