calculating
adjective /ˈkælkjuleɪtɪŋ/
  /ˈkælkjuleɪtɪŋ/
(disapproving)- good at planning things so that you have an advantage, without caring about other people
- a cold and calculating killer
 - I never realized you could be so calculating.
 - She caught a coolly calculating glint in the other woman’s eye.
 
Oxford Collocations Dictionaryverbs- be
 
- coldly
 
- cold and calculating