The quivering of the chin,
the thrusting forward or sideways of the jaws,
the twitching of the cheek and corners of the mouth,
the pursing of the lips,
the biting of the tongue,
the crinkling of the nose,
the squinting and rolling of the eyes,
the fluttering and blinking of the eyelids,
the raising of the eyebrows,
and the furrowing of the forehead.
These involuntary momentary expressions on the naked face,
some of them even displayed by babies,
may help you understand what is left unsaid.