Vigilance (12)
'vigilance' is the definition.
(synonyms)
This is all the clue.
(Other definitions for alertness that I've seen before include "Watchful attitude" , "It's needed to respond quickly to danger" , "Showing attentive nature" , "Watchful state" , "Wakeful characteristic" .)
'vigilance' is the definition.
(I know that vigilance can be written as watchfulness)
This is all the clue.
(Another definition for watchfulness that I've seen is " Vigilance".)