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

See also: unready

• fuller
• fuller's earth
• fuller's teasel
• fullerene
• fullness
• fully
• fully fashioned
• fully fledged
• fully grown
• fulmar
• fulmar petrel
• Fulmarus
• Fulmarus glacialis
• fulminant
• fulminate
• fulminate of mercury
• fulminating mercury
• fulmination
• fulminic acid
• fulness
• fulsome
• fulsomely
• fulsomeness
• Fulton
• fulvic acid