unemotionaladjective
uk/ˌʌn.ɪˈməʊ.ʃən.əl//ˌʌn.ɪˈmoʊ.ʃən.əl/not having or expressing strong feelings, often when this is surprising or a bad thing:
Investigators said the couple seemed oddly unemotional about the disappearance.
They described him as cold and unemotional.
not allowing strong feelings to influence your decisions:
He was rational and unemotional in his response.