1) Absence of emotion 2) Apathy 3) Emotionlessness 4) Impassiveness 5) Impassivity 6) Indifference 7) Phlegm 8) Stolidity 1) Blandness 2) Dispassion 3) Dispassionateness 4) Emotionlessness 5) Impassiveness 6) Impassivity 7) Phlegm 8) Stoicism 9) Stolidity 10) Stolidness 
[n] - absence of emotion
emotionlessness noun absence of emotion