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

• diazoxide
• dibasic
• dibasic acid
• dibasic salt
• dibber
• dibble
• dibbuk
• dibrach
• dibranch
• Dibranchia
• Dibranchiata
• dibranchiate
• dibranchiate mollusk
• dibs
• dibucaine
• dicamptodon
• Dicamptodon ensatus
• dicamptodontid
• Dicamptodontidae
• dicarboxylic
• dice
• dice box
• dice cup
• Dicentra
• Dicentra canadensis