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

See also: wary

• vinous
• Vinson
• vintage
• vintage car
• vintager
• vintner
• viny
• vinyl
• vinyl cyanide
• vinyl ether
• vinyl group
• vinyl polymer
• vinyl radical
• vinyl resin
• vinylbenzene
• Vinylite
• Viocin
• viol
• viola
• Viola arvensis
• Viola blanda
• Viola canadensis
• Viola canina
• viola clef
• Viola conspersa