The English language continues to beffudle and amuse me. For example, if "polite" is the opposite of "impolite," why isn't "portant" the opposite of "important"?
Or, if "unimportant" is the opposite of "important," then why isn't "unimpolite" the opposite of "impolite"?
I sometimes think the folks who were there in the beginning of the development of the English language laughed themselves silly at the thought of future generations trying to learn the language. To them I say, "That's not very unimpolite of you!"