obtusion
/əbˈtjuːʒn/ /ɒbˈtjuːʒn/ /əbˈtʃuːʒn/Chiefly Medicine rare
noun
The action of blunting or dulling; the condition of being blunted or dulled; (now, Medicine ) = obtundation.
Origin
Early 17th century. From Middle French, French obtusion action of blunting or dulling, dullness of mind from post-classical Latin obtusion-, obtusio action of blunting or dulling, condition of being blunted or dulled (Vetus Latina) from classical Latin obtūs-, past participial stem of obtundere + -iō.