How can you talk without saying a word? Just use your face!
According to psychologist David B. Givens, you can send covert messages just by changing up your facial expressions. For example:

• brow flash: Do this by making eye contact and quickly raising and lowering your brows. People interpret this gesture as an indication of attraction.
• Then there's the head cock. Tip your head toward your right or left shoulder to show someone that you understand where they're coming from. The tilt indicates empathy and comfort toward the person.
• Another way to send a message with just a look: Clench your jaw. According to Givens, this projects angst. He says you unwittingly clench your jaw when you're angry, but you an also do it consciously to make a point.
• And finally, there's the lip droop. Let the corners of your mouth droop slightly downward, but not a full-on pout. Mimicking a frown inspires compassion in whomever you're talking to.