Usually means: Extremely vigilant, responsive to stimuli.
Definitions Related words Mentions
We found 4 dictionaries that define the word hyperalert:

General (3 matching dictionaries)
  1. hyperalert: Merriam-Webster
  2. hyperalert: Collins English Dictionary
  3. hyperalert: Wiktionary

Medicine (1 matching dictionary)
  1. hyperalert: Merriam-Webster Medical Dictionary

Definitions from Wiktionary (hyperalert)

adjective:  Excessively alert, especially as a result of traumatic stress.

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