Most dissentient is an adjective that describes someone or something that is the most disagreeable or nonconformist among a group. The antonyms for most dissentient can be agreeable, harmonious, cooperative, united, and mainstream. Agreeable refers to someone or something that is pleasant, friendly, or accommodating. Harmonious means having a peaceful or melodious relationship with others. Cooperative describes someone who is willing to work together with others for a common goal. United refers to a group that is joined together in a common purpose or opinion. Mainstream is a term used to describe something that is widely accepted or popular in society. These words represent the opposite of most dissentient and convey the idea of unity and cooperation.