The phrase "rendered insensible" can be replaced by several synonyms in the English language. For instance, words like numb, anesthetize, desensitize, benumb, stun, and paralyze all maintain the same meaning as "rendered insensible." Each of these synonyms refers to an action that causes the temporary or permanent loss of sensation or consciousness. Often, these words are used in medical contexts to describe the effects of anesthetics or trauma. That said, depending on the specific context, any of these synonyms might be more fitting than others. Therefore, it is crucial to use proper discretion when selecting which synonym to use.