stupor

Short definition from Wiktionary

Noun

1. 1
   A state of greatly dulled or completely suspended consciousness or sensibility; (particularly medicine) a chiefly mental condition marked by absence of spontaneous movement, greatly diminished responsiveness to stimulation, and usually impaired consciousness.
2. 2
   A state of extreme apathy or torpor resulting often from stress or shock.

Verb

1. 1
   To place into a stupor; to stupefy.