1. Vigilant
   "on guard against con artists"
   - on one's guard, upon one's guard, on your guard

See also: wary

• veritably
• verity
• verjuice
• Verlaine
• Vermeer
• vermeil
• vermicelli
• vermicide
• vermicular
• vermiculate
• vermiculated
• vermiculation
• vermiculite
• vermiform
• vermiform appendix
• vermiform process
• vermifuge
• vermilion
• vermillion
• vermillion flycatcher
• vermillion rockfish
• vermin
• verminous
• vermis
• vermis cerebelli