Opiniative is a word that refers to someone who holds strong opinions or expresses their beliefs forcefully. Synonyms for the word opiniative include opinionated, dogmatic, pontificating, vociferous, adamant, firm, stubborn, headstrong, tenacious, and uncompromising. These descriptive words can be used to describe someone who is assertive in their beliefs, even if they may not be open to considering alternative viewpoints. While it can be valuable to have strong opinions and convictions, it is important to remain open-minded and receptive to new ideas and perspectives in order to continue learning and growing.