1. in a strong, steady way that does not move or change easily
2. in a determined way that shows you will not change your mind
3. in a strict or severe manner

Examples

• She gripped the rope firmly with both hands.
• The table legs must be firmly attached to prevent wobbling.
• He firmly believed that education was the key to success.
• The teacher firmly told the students to sit down.
• She firmly refused to change her decision.
• The door was firmly closed and wouldn’t budge.
• The company’s policy is firmly established.