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

• half step
• half title
• half track
• half volley
• half-and-half
• half-and-half dressing
• half-arsed
• half-assed
• half-baked
• half-blooded
• half-bound
• half-bred
• half-breed
• half-caste
• half-century
• half-clothed
• half-cock
• half-crazed
• half-dozen
• half-evergreen
• half-free morel
• half-hardy
• half-heartedly
• half-heartedness
• half-holiday