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

See also: unready

• hyalite
• hyaloid
• hyaloid membrane
• Hyalophora
• Hyalophora cecropia
• hyaloplasm
• hyaloplasmic
• Hyalosperma
• Hyalospongiae
• hyaluronic acid
• hyaluronidase
• Hyazyme
• Hybanthus
• hybrid
• hybrid petunia
• hybrid tuberous begonia
• hybrid vigor
• hybridisation
• hybridise
• hybridising
• hybridism
• hybridity
• hybridization
• hybridize
• hybridizing