(UNFRIENDLY) [adjective] -er, -est - unfriendly or not showing affection or interest in something or someoneIs something the matter? You seem a bit cool towards me, as if you didn't want to be here.I got a rather cool reception/welcome this evening. What do you think I've done wrong?Didn't you like my suggestion about going to my mother's for the holidays? You seemed a bit cool (about it).(informal usually humorous) A cool customer is someone who does not show much personal feeling and whose manner is so calm that it is almost offensive.
COOL
Meaning of COOL in English
Cambridge English vocab. Кембриджский английский словарь. 2012