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

See also: critical

• swimming crab
• swimming event
• swimming hole
• swimming kick
• swimming meet
• swimming pool
• swimming stroke
• swimming trunks
• swimmingly
• swimsuit
• swimwear
• Swinburne
• swindle
• swindler
• swine
• swine feaver
• swine flu
• swine influenza
• swineherd
• swing
• swing about
• swing around
• swing door
• swing music
• swing out