1. Causing fear or anxiety by threatening great harm
   "a life-threatening disease"
   - dangerous, grave, grievous, serious, severe

See also: critical

• connive
• connive at
• conniver
• conniving
• Connochaetes
• connoisseur
• connoisseurship
• Connolly
• Connors
• connotation
• connotational
• connotative
• connotative of
• connote
• connubial
• Conocarpus
• Conocarpus erectus
• Conoclinium
• Conoclinium coelestinum
• conodont
• Conodonta
• Conodontophorida
• conoid
• conoidal
• Conopodium