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

See also: critical

• abstractionism
• abstractionist
• abstractive
• abstractly
• abstractness
• abstractor
• abstruse
• abstrusely
• abstruseness
• abstrusity
• absurd
• absurdity
• absurdly
• absurdness
• Abu Ali al-Husain ibn Abdallah ibn Sina
• Abu Dhabi
• Abu Hafs al-Masri Brigades
• Abu Nidal Organisation
• Abu Nidal Organization
• Abu Sayyaf
• Abudefduf
• Abudefduf saxatilis
• Abuja
• Abukir
• Abukir Bay