1. Vigilant
   "on guard against con artists"
   - on one's guard, upon one's guard, on your guard

See also: wary

• genus Haematoxylum
• genus Haemodorum
• genus Haemopis
• genus Haemoproteus
• genus Haemulon
• genus Hakea
• genus Halcyon
• genus Haldea
• genus Halenia
• genus Halesia
• genus Haliaeetus
• genus Halicoeres
• genus Halimodendron
• genus Haliotis
• genus Halocarpus
• genus Halogeton
• genus Hamamelidanthum
• genus Hamamelidoxylon
• genus Hamamelis
• genus Hamamelites
• genus Hamelia
• genus Haminoea
• genus Haplopappus
• genus Hardenbergia
• genus Harpia