Antonyms for the word "fence-sitting" include polarizing, decisive, determined, committed, resolute, opinionated, firm, staunch, unwavering, and uncompromising. These words all suggest a clear position or strong belief on a particular issue, rather than remaining neutral or indecisive. Instead of straddling the fence, a person who is polarizing or opinionated takes a stand and advocates for their beliefs. Similarly, someone who is committed or unwavering is dedicated to a cause or idea and is not easily swayed. By using antonyms for "fence-sitting," we can encourage people to take a stand and actively engage in the issues that matter to them.