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

See also: unready

• residual clay
• residual oil
• residual soil
• residuary
• residue
• residuum
• resift
• resign
• resignation
• resignedly
• resile
• resilience
• resiliency
• resilient
• resiliently
• resin
• resinate
• resinated
• resinlike
• resinoid
• resinous
• resiny
• resist
• resistance
• resistance pyrometer