Such a person could be described with an adjective such as unemotional.
Emotionless.
Such a person is called a narcissist.
It's called bi-polar
Projection
you don't it's better to tell them in person
A homeless person or a hobo.
A play without words is called a ballet, or pantomime. A person who acts without words, is called a mime.
i believe that is called a low self esteem
"Empathic" or "empathetic" means that you are sensitive to the feelings/emotions of another person without actually feeling them yourself.
A person who acts without thinking is usually called "impulsive."
A desire to eat without feelings of hunger is called appetite
Unless a person or groups of people are brain-washed (the military has experimented in this) then no, you cannot learn without having feelings or emotions.
No, you can hurt someone's feelings without abusing them. Psychological abuse is the deliberate attempt to cause anxiety, depression, or loss of self-esteem, typically in trying to control another person and their actions.