How do you describe someone who speaks without thinking through his brain?

A person who speaks without thinking through his brain is described as follows:

1. His words often blurt out without being filtered by the brain, like an impulse like a gale, sometimes making people laugh, sometimes making people laugh, and sometimes making people laugh. Embarrassing.

2. He is like an unguarded fountain, speaking without thinking, and all thoughts and emotions spurt out without reservation, directly and candidly.