Verbally we can say one thing but say something else with our nonverbal behaviors which is very confusing to the receiver. Nonverbal assists us in our ability to detect deception. We can determine when someone is trying to deceive us by paying attention to their nonverbal behavior. It is very hard to control nonverbal behavior consciously, so in cases like this, we need to let the nonverbal messages override the verbal messages. There is not so much a conscious effort to control our nonverbals.
Words are arbitrary.
Language is based on experiences. Not everyone experiences the same things, thus, everyone has a different frame of reference in which they use language. Each person is privy to a connotative and a denotative definition of a word. The connotative definition is based on our experiences because we can relate a word with an experience. This could be an enormous limitation in the respect that we may be in a conversation with an individual who has a larger frame of reference than we do, which can lead to misunderstanding the message or cause psychological noise for us making it hard to listen to the message.