cold fish vs hard-boiled

cold fish

noun
  • A heartless individual; a person lacking empathy and emotion. 

  • A sexual partner who, during sex, lacks vigor or emotional reciprocity. 

hard-boiled

adj
  • Written in a laconic, dispassionate, often ironic style for a realistic, unsentimental effect. 

  • Cooked to a solid consistency. 

  • Callous and unsentimental. 

How often have the words cold fish and hard-boiled occurred in a corpus of books? (source: Google Ngram Viewer )