The phrase "most assentive" can be replaced by several synonyms that convey the same meaning. For instance, the word "agreeable" is a perfect substitute for "most assentive" as it signifies a willingness to agree or comply. Another option is to use "conciliatory," which implies a desire to make peace and avoid conflict. Similarly, "compliant" and "obedient" can be used interchangeably with "most assentive," as they denote a readiness to follow instructions or adhere to rules. Additionally, "acquiescent" and "submissive" can also be used in place of "most assentive," as they suggest a yielding attitude. Therefore, depending on the context, any of these synonyms can be used to replace "most assentive".