hard shelled

/ˈhɑrdˌʃɛld/
adjective
  1. Having a hard outer covering or shell.
    • Hard-shelled nuts like walnuts require a nutcracker to open.
    • The hard-shelled turtle retreated into its shell when it sensed danger.
    • The farmer collected hard-shelled beetles from the garden.
  2. Firmly established or resistant to change; rigid in attitude or belief.
    • Her hard-shelled opinions on the matter made compromise difficult.
    • The club's hard-shelled rules had been in place for decades.
    • The hard-shelled traditionalist refused to accept any modern changes.
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