dis·pas·sion·ate
disˈpaSH(ə)nət
adjective
not influenced by strong emotion, and so able to be rational and impartial.
synonyms: unemotional, emotionless, impassive, cool, calm, 'calm, cool, and collected',
unruffled,
unperturbed, composed, self-possessed, self-controlled,
unexcitable