1. Not prepared or vigilant
   - napping, off-guard, off guard, off his guard, off her guard, off your guard

See also: unready

• data rate
• data structure
• data system
• data track
• data-based
• data-storage medium
• database
• database management
• database management system
• datable
• dataglove
• dataset
• date
• date back
• date bar
• date bread
• date from
• date of reference
• date palm
• date plum
• date rape
• date stamp
• date-nut bread
• dateable
• dated