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lockjawed (comparative more lockjawed, superlative most lockjawed)

  1. (informal) Rigidly humourless.
    • 2007 June 4, Ben Brantley, “Bound by Blood, but Separated by a Breach in Sanity”, in New York Times[1]:
      A work that never quite succeeds in matching its thoughtful head to its sentimental heart, “Crazy Mary” charts a culture clash between a lockjawed, button-down matron and her distant cousin, a longtime sanitarium resident who is, to put it politely, bonkers.