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

• leaflet
• leaflike
• leafnose bat
• leafstalk
• leafy
• leafy liverwort
• leafy spurge
• leafy vegetable
• leafy-stemmed
• league
• League of Iroquois
• League of Nations
• league table
• league together
• leaguer
• leak
• leak fungus
• leak out
• leakage
• leaker
• Leakey
• leakiness
• leakproof
• leaky
• leal