1. (adverb) in a grave and sober manner

• soberly
• staidly

2. (adverb) to a severe or serious degree

• badly
• seriously
• severely

1. (adverb) in a grave and sober manner

• grave
• grave
• sedate
• sedate
• sober
• sober
• solemn
• solemn
• sedate
• staid

2. (adverb) to a severe or serious degree

• dangerous
• dangerous
• grave
• grave
• grievous
• grievous
• life-threatening
• life-threatening
• serious
• serious
• severe
• severe
• severe
• terrible
• wicked