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

• lean
• lean against
• lean back
• lean on
• lean-to
• lean-to tent
• Leander
• leaner
• leaning
• Leaning Tower
• Leaning Tower of Pisa
• leanness
• leap
• leap day
• leap out
• leap second
• leap year
• leaper
• leapfrog
• leaping
• Lear
• learn
• learnable
• learned
• learned person