1. In a grave and sober manner
   - soberly, staidly 
2. To a severe or serious degree
   "is gravely ill"
   - badly, severely, seriously, critically

See also: grave

• casual
• casually
• casualness
• casuals
• casualty
• Casualty Care Research Center
• Casuaridae
• Casuariiformes
• casuarina
• Casuarina equisetfolia
• Casuarinaceae
• Casuarinales
• Casuarius
• casuist
• casuistic
• casuistical
• casuistry
• casus belli
• cat
• cat and mouse
• cat and rat
• cat bear
• cat box
• cat burglar
• cat cracker