Final answer:
An antonym for 'opinionated' is 'open-minded', which describes someone who is willing to consider other viewpoints, as opposed to being stubbornly attached to their own opinions.
Step-by-step explanation:
The antonym for opinionated is open-minded. The term 'opinionated' refers to a person who is stubbornly or unduly attached to their own opinions and unwilling to consider others. Hence, a person who is described as open-minded is the opposite, as they are receptive to various viewpoints and willing to consider alternative perspectives and opinions.
In the context of political science, an opinion is an individual's feelings or beliefs about a particular issue, which is shaped by their attitudes and experiences. People with open-minded attitudes are more likely to support inclusive policies and entertain a wide range of ideas without strong predisposition to one perspective.