1. in an excessively eager or enthusiastic manner; with too much zeal

Examples

• The security guard overzealously checked every bag twice.
• She overzealously enforced the dress code, citing students for minor infractions.
• The new employee overzealously volunteered for every project.
• The referee was criticized for overzealously calling fouls.
• He overzealously promoted the company’s products to his friends.
• The teacher overzealously graded papers, marking every tiny error.