inarticulate — lacking the ability to express oneself, especially in clear and effective speech: an inarticulate public speaker.
apathetic — If you describe someone as apathetic, you are criticizing them because they do not seem to be interested in or enthusiastic about doing anything.
calm — A calm person does not show or feel any worry, anger, or excitement.
cold — Something that is cold has a very low temperature or a lower temperature than is normal or acceptable.
cool — Something that is cool has a temperature which is low but not very low.
dispassionate — free from or unaffected by passion; devoid of personal feeling or bias; impartial; calm: a dispassionate critic.