2. They show they're genuinely glad to meet you
They maintain eye contact. They smile when you smile. They frown when you frown. They nod your head when you nod. In simple, nonverbal ways, they mimic your behavior — not slavishly, but because they're focused on what you're saying.
That feedback loop helps two people bond — and the ability to bond is the essence of charm. If you want more ways to be likeable, check this out.