hard-boiled

adjective3

1. •
   Of a boiled egg, cooked to a solid consistency.
2. •
   (figurative) Of a person, especially a detective, callous and unsentimental.

   • 'Some big, hard-boiled egg meets up with a pretty face, and bingo! He cracks up and melts.' — 1932
3. •
   (figurative) Written in a laconic, dispassionate, often ironic style for a realistic, unsentimental effect.