The Collaborative International Dictionary
Obtusion
Obtusion \Ob*tu"sion\, n. [L. obtusio, from obtundere to blunt. See Obtund.]
The act or process of making obtuse or blunt.
The state of being dulled or blunted; as, the obtusion of the senses.
--Harvey.
Wiktionary
obtusion
n. (context medicine English) The blunting, dulling, or weakening of normal sensation.