Definition of obtundation in US English:

obtundation

noun

Medicine
  • A state or condition characterized by a reduced level of consciousness with diminished responsiveness to stimuli (typically at a level between lethargy and stupor).

Origin

1960s; earliest use found in Journal of the American Medical Association. From obtund + -ation.

Pronunciation

obtundation

/ˌɒbtʌnˈdeɪʃn/