Savages

 some are just like a savage 

cant understand, dont listen, superstitious, lack curiosity, form opinions and say they are facts

lack understanding, language skills are subprime basic level sometimes just grunts and groans ..words are often misinterpreted and used improperly

training a person who is over a certain age and attempting to teach them manners, civility, empathy, language is almost impossible 

if they did not learn to be polite, inquisitive, empathetic and benevolent things when they were children it is doubtful they will learn it as a teen or and adult over 18

cannot learn, unteachable, not trainable after a certain age

they only believe when they see and often believe in imaginary things that are not proven