Gossip

Gossip may very well be the greatest, or at least, the most subtle form of lying. After all, those lies that are half-truths are often more deceptive than full lies, but unlike white lies, which often cover up the dark side to look only at the bright side, gossip covers up the bright side  -- leaving the listener only to believe that the person gossipped about is merely dark,  with no chance of the bright side shining through.