1) Automatic 2) Cold 3) Icy 4) Impassive 5) Robotic 6) Stoic 7) Stoical 8) Stolid 9) Stony 10) Unemotional 1) Cold 2) Impassive 3) Passionless 4) Unmoved by feeling 
[adj] - unmoved by feeling
passionless adjective unmoved by feeling; `he kept his emotionless objectivity and faith in the cause he served`; `this passionless girl was like an icicle in the sunshine`-Margaret Deland