Some synonyms for "important" include:

• Essential
• Significant
• Crucial
• Substantial
• Major
• Monumental
• Pivotal
• Critical
• Consequential
• Momentous
• Weighty
• Earth-shattering

These words can be used to convey the same meaning as "important" in different contexts. For example, "essential" might be used to describe something that is necessary for a particular task or goal, while "momentous" might be used to describe an event that has great historical significance.