Lack of certainty, causing doubt or indecision in things. This is how the Dictionary of Authorities of the RAE defines uncertainty.
Stressed, irritated, overwhelmed, or even angry. This is how we feel when we have uncertainty.
One of the characteristics of emotions is their hedonic tone, that is, how good or bad they make us feel.
All emotions, both those that make us feel good and those that don’t, are necessary for the development of life. However, among those that make us feel bad, there is one that is very difficult for us to tolerate, and that is uncertainty. To combat it or attempt to tolerate it, we invent information to alleviate what uncertainty provokes in us. That’s why we imagine what might happen in the future or give a face to a radio announcer we’ve never seen before.
To try to find certainty when it doesn’t exist.