artful

artful - clever at getting what you want perhaps by not telling the truth
-dictionary
art - ful - l
isn´t it amazing?
isn´t it weird?
art +full -l = artful
how can be art in the word what describes the worst  people´s character
can anybody tell me?
Or does it mean that somebody who is artful is opposite of human which is full of art?
Because there is minus l?
I hate people who is artful
but I love anything what is connect with art.
Art is the most beutifull word in the whole word,
so how can be in this most ugly word. How how?