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

See also: critical

• Port Jackson pine
• Port Louis
• Port Moresby
• port of call
• port of entry
• Port of Spain
• Port Orford cedar
• Port Sudan
• Port Vila
• port wine
• port-access coronary bypass surgery
• Port-au-Prince
• port-wine stain
• porta
• porta hepatis
• portability
• portable
• portable circular saw
• portable computer
• Portable Document Format
• portable saw
• portacaval shunt
• portage
• portal
• portal hypertension