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

• Centrosema
• Centrosema virginianum
• centrosome
• centrosomic
• Centrospermae
• centrosymmetric
• centrum
• Centunculus
• centuple
• centurion
• century
• century plant
• CEO
• cep
• cephalad
• cephalalgia
• Cephalanthera
• Cephalanthera rubra
• cephalaspid
• Cephalaspida
• cephalexin
• cephalhematoma
• cephalic
• cephalic index
• cephalic vein