Definition of expressionlessness in US English:

expressionlessness

noun

  • See expressionless

    • ‘Alexis's face slipped back into it's normal expressionlessness.’
    • ‘His face was finely boned and almost feminine but its utter expressionlessness dared someone - anyone - to have the guts to call him girly.’
    • ‘It's most noticeable in the quiet scenes where he draws nothing from his face except expressionlessness.’
    • ‘Allisa quickly dropped the face of near-hysterics and put on a face of expressionlessness.’
    • ‘Her eyes were wide open and crystal clear, but instead of the warmth of lucidity, they burned with the ice of expressionlessness.’