As O’Barr had predicted, slight differences in wording changed how the witness was perceived. Speaking like a professional made the witness seem more credible. Listeners saw them as more trustworthy, competent, and convincing, and were more likely to believe what they had to say.

In the years since then, scientists have refined the exact components of “powerful” language. But at its core, the main idea remains the same. Speaking with power makes people seem confident. It makes them seem more certain, self-assured, and knowledgeable, which makes audiences more likely to listen and change their minds.

Words do more than just convey facts and opinions. They signal how confident communicators are in the facts and opinions they are expressing. Consequently, words influence how we’re perceived and the impact of what we say. Want to be perceived more positively? Increase your impact?

• Ditch the hedges. When the goal is to convey confidence, avoid words and phrases like “may,” “could,” and “in my opinion,” which suggest that things, and the people saying them, are uncertain

• Use definites. Rather than hedging, use definites instead. Words like “definitely,” “clearly,” and “obviously,” which suggest whatever was said isn’t just an opinion, it’s an irrefutable truth.

• Don’t hesitate. Ums and uhs are natural parts of speech, but too many of them can undermine people’s confidence in us and our message. So cut the fillers. To decrease hesitations, plan what to say in advance or pause to collect your thoughts when needed.

• Turn pasts into presents. Using the present tense can communicate confidence and increase persuasion. So to signal certainty, rather than using past tense (e.g., “I loved that book”), use present tense (e.g., “I love that book”) instead.

• Know when to express doubt. While seeming to be certain is often beneficial, if we want to show we’re open minded, receptive to opposing viewpoints, or aware of nuances, expressing doubt can help.

By harnessing the language of confidence, we can signal our expertise, showcase our

openness to opposing viewpoints, and encourage others to go along with what we’re suggesting.

When people become aware of their behaviour in the linguistic domain, they achieve greater effectiveness, greater satisfaction, and a better mood.

A serious problem with reactive language is that it becomes a self-fulfilling prophecy. People become reinforced in the paradigm that they are determined, and they produce evidence to support the belief. They feel increasingly victimized and out of control, not in charge of their life or their destiny. They blame outside forces—other people, circumstances, even the stars—for their own situation.