“Still, there’s something to be said for gut feelings.

“Rapport … is the essence of all human connection and development.”

But the opposite is true as well.

Woman ignoring her friend waving

To get a clue, look at the way they smile.

“By displaying a one-sided smile, they are almost leaking the emotion of contempt,” Stanton says.

Another giveaway of a fake grin is the eyes.

Woman curly hair half smile

When our joy is just a put-on, the eye muscles stay relaxed.

Of course, context is everything.

You’re also likely to see that half-grin after you’ve told a groaner of a joke.

Two women talking

But if your pal flashes that pseudo-smile almost constantly, take it as a warning.

They’ll celebrate your big and little victories alike.

Think about the last time you shared some good news with a friend.

Woman wrinkle nose disgust

And was this a one-time incident, or is it an ongoing issue?

If a pal seems uninvested in your well-being, it’s time to reevaluate the relationship.

Ditto if the friend seems happiest when you’re miserable.

Sad woman waiting coffee shop

This subtle gesture signals that the person literally finds you unpleasant to be around.

Disgust often manifests itself in one’s general attitude as well, according toPublic Words.

I’m getting the sense we’re drifting apart; how do you feel about our friendship?”

But again, actions speak louder than words.