We hedge all the time. We note that we think something will work, that a solution could be effective, or that an alternate approach might work better. We suggest that something seems like a good course of action or that, in our opinion, something else is worth trying.

But without our realizing it, hedging can undermine our impact, because while we’re sharing our thoughts or recommendations, by hedging, we’re simultaneously undercutting them. We’re suggesting that we’re not sure those thoughts and recommendations are worth pursuing.

Hedging makes people seem less confident, less powerful, and less effective, but there’s another linguistic choice that hurts even more, and that is hesitations.

But in this context, it turned out that the exact opposite occurred. Expressing doubt about a contentious issue actually increased persuasion. Particularly among people who already had strong beliefs, hearing someone else wasn’t sure about their opinion encouraged them to change their mind in that direction.

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.

Behavioral scientists have conducted hundreds of studies about the differences between powerful and powerless words and phrases. We are especially smitten with research led by Jonah Berger at the University of Pennsylvania and by our Stanford colleague Jennifer Aaker. We draw mostly on their work to generate five tips about the kind of talk that provokes people to act, persist, and develop imaginative solutions.