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headmistressy

British  
/ ˌhɛdˈmɪstrɪsɪ /

adjective

  1. typical of the duties and behaviour of a headmistress

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Photograph: Kevork Djansezian/Getty Images Before the awards were even handed out, Twitter went to town with the leaked wardrobe memo from CBS and its hilariously headmistressy dictums.

From The Guardian