1. Not prepared or vigilant
   - napping, off-guard, off guard, off one's guard, off his guard, off her guard

See also: unready

• flag-waving
• flagellant
• Flagellata
• flagellate
• flagellate protozoan
• flagellated
• flagellated cell
• flagellated protozoan
• flagellation
• flagellum
• flageolet
• flagfish
• flagging
• flagitious
• flagman
• flagon
• flagpole
• flagrance
• flagrancy
• flagrant
• flagrantly
• flagroot
• flagship
• flagstaff
• flagstone