1. Extremely alarming
   - hair-raising, nightmarish

See also: alarming

• Constantina
• Constantine
• Constantine I
• Constantine the Great
• Constantinople
• constantly
• constatation
• constellate
• constellation
• consternate
• consternation
• constipate
• constipated
• constipation
• constituency
• constituent
• constitute
• constituted
• constitution
• Constitution of the United States
• Constitution State
• constitutional
• Constitutional Convention
• Constitutional Union Party
• constitutionalise