hardhead

/ˈhɑrdˌhɛd/
noun
  1. A stubborn or obstinate person.
    • My grandfather is a hardhead who refuses to use a smartphone.
    • The teacher called him a hardhead because he wouldn't change his essay topic.
    • Don't be such a hardhead; just listen to the doctor's advice.
  2. A type of fish, especially a saltwater catfish with a hard, bony head.
    • We caught a hardhead while fishing off the pier.
    • The hardhead is known for its sharp spines and tough skin.
    • He threw the hardhead back because it was too small to keep.
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