what is another word for serious

Some synonyms for "serious" include:

• Grave
• Solemn
• Thoughtful
• Earnest
• Sincere
• Sedate
• Somber
• Pensive
• Weighty
• Important
• Crucial
• Urgent
• Consequential
• Significant
• Essential
• Imperative
• Key
• Pivotal
• Profound
• Considerable