it means that you think without acting, you do things impulsively without actually thinking them through beforehand.
Thoughts aloud means when you are acting the person says what they are thinking from their head.
Acting impulsively and without sufficient forethought.
The object of the propositional phrase "from head" depends on the context in which it is used. It can mean someone is thinking or acting without careful consideration, or it can refer to something originating from a particular source or starting point.
It means be self-confident, but not snobbish. Feel good about yourself without thinking or acting like you're better than others.
"Reading without thinking leads to a cluttered mind overwhelmed with information. On the other hand, thinking without reading can result in a lack of context and depth in one's thoughts, making them unbalanced and uninformed."
talking without thinking what words are coming out your mouth.
It means that a person has spoken without really thinking. Most of the time it is used in reference to bragging without backing it up or talking without thinking of the consequence.
What is mean by acting
Perhaps you are thinking of Tourette's syndrome.
"Dive in head first" is to rush into a situation without thinking.
manner of acting