1. Not prepared or vigilant
   "caught in an off-guard moment"
   - napping, off guard, off one's guard, off his guard, off her guard, off your guard

See also: unready

• prolific
• prolificacy
• prolifically
• proline
• prolix
• prolixity
• prolixly
• prolixness
• prolocutor
• Prolog
• prologise
• prologize
• prologue
• prologuise
• prologuize
• prolong
• prolongation
• prolonge
• prolonge knot
• prolonged
• prolonged interrogation
• prolusion
• prolusory
• prom
• promenade