1. Vigilant
   "must remain on your guard in such a situation"
   - on guard, on one's guard, upon one's guard

See also: wary

• private practice
• private property
• private road
• private school
• private security force
• private treaty
• private-enterprise
• privateer
• privateersman
• privately
• privately held corporation
• privateness
• privates
• privation
• privatisation
• privatise
• privative
• privatization
• privatize
• privet
• privet andromeda
• privet hedge
• privilege
• privilege against self incrimination
• privilege of the floor