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

• rockcress
• Rockefeller
• rocker
• rocker arm
• rockers
• rockery
• rocket
• rocket base
• rocket cress
• rocket engine
• rocket engineer
• rocket firing
• rocket fuel
• rocket larkspur
• rocket launcher
• rocket launching
• rocket propellant
• rocket propellent
• rocket propulsion
• rocket range
• rocket salad
• rocket science
• rocket scientist
• rocket-propelled
• rocketeer