Hesitancy:

"People who are anxious often wait to start things until they feel 100% sure that they're going to be successful. So, they don't like to take an action if they feel they've got any chance of failure, and they tend to interpret uncertainty as a sign that they should be putting on the brakes. They might start something but feel that uncertainty — and then shove those brakes on and not follow through or get momentum. [Some] people tend to combine this with over-researching. Smart people have been rewarded their whole lives for their thinking and their ability to research, so they tend to approach everything with that same style."