A trustworthy person knows uncertainty should change language.

Language should track knowledge. Saying that something is likely, or that you believe it, or that you are certain of it, are three different claims, and a person worth trusting uses the one that matches. Flattening all of them into flat assertion is efficient and it destroys the information other people need to weigh what you said. The hedges are not weakness; they are data.

Listen to your own phrasing over the next few days and notice where you assert what you only suspect. Adjust the wording rather than the confidence. People learn quickly whose qualifiers can be relied on.