Используйте «unemotional person» в предложении

1. The perfectly unruffled manner in which Terence had been acting and the genuineness with which he answered this question seemed highly to contradict the demeanour of a murderer; however, Feltus found it curious that this suspect had said nothing until now and realized that Terence may just be a cold, unemotional person capable of the most despicable crimes

2. The completely unemotional person tends to lack drive and to appear cold by others