Total wordlessness — used when something is too shocking, awkward, or absurd for any comment, essentially the emoji version of stunned silence. Its lack of a mouth entirely (rather than just a closed one) makes it feel more extreme than a simple neutral face, closer to 'I have nothing to say.'
Keywords: awkward, blank, expressionless, face, mouth, mouthless, mute, quiet, secret, silence, silent, speechless