Opiniativeness refers to the stubbornness or inflexibility of an individual when it comes to their opinions or beliefs. Some synonyms for opiniativeness are dogmatism, obstinacy, rigidity, pigheadedness, and adamant. Dogmatism refers to a strict adherence to a particular belief or ideology, without considering other alternatives. Obstinate implies refusing to change one's mind, even when faced with overwhelming evidence. Rigidity refers to a lack of adaptability, with a person unwilling to make changes or consider new ideas. Pigheadedness implies being stubborn and unwilling to listen to other's advice. Adamant means being firm and resolute in one's convictions, despite opposition or criticism.