1. Extremely alarming
   - hair-raising, nightmarish

See also: alarming

• hertz
• Hertzian
• Hertzian wave
• Hertzsprung-Russell diagram
• Herzberg
• Heshvan
• Hesiod
• hesitance
• hesitancy
• hesitant
• hesitantly
• hesitate
• hesitater
• hesitating
• hesitatingly
• hesitation
• hesitator
• Hesperian
• Hesperides
• hesperidium
• Hesperiphona
• Hesperiphona vespertina
• Hesperis
• Hesperis matronalis
• Hesperus