What does it mean when a person won't look you in the eyes?

United States
@deejean06 (1955)
May 7, 2009 9:05am CST
Does it have a significance when someone won't look you in the eyes when they're speaking to you? Is it embarrassment? Is it guilt? It makes me uncomfortable when someone won't look me in the eyes when they are speaking with me. It makes me think there is something I don't know that is happening. What do you think? What do you do?