Attitudinarian refers to a person who adopts a specific attitude or stance and sticks to it rigidly. Synonyms for attitudinarian include dogmatist, ideologue, opinionated, inflexible, rigid, doctrinaire, and uncompromising. A dogmatist is someone who is driven by strong beliefs and is rigid in their thinking, often unwilling to accept alternative views. An ideologue is someone who is committed to a specific ideology or set of ideas and refuses to accept any other perspectives. Opinionated individuals are those who hold strong opinions and are often unwilling to accept alternative viewpoints. Inflexible, rigid, and uncompromising are all adjectives that describe someone who refuses to bend or yield in their beliefs. Finally, a doctrinaire is someone who is rigidly dogmatic and inflexible in their ideologies or beliefs.