Explanation:

- Emetic: Refers to something that induces vomiting. Often used in medical contexts to describe substances that cause a person to vomit.

- Option 1: Decisive - Indicates the ability to make firm decisions quickly.

- Option 2: Causing vomiting - Directly matches the definition of emetic. Associated with substances that provoke vomiting.

- Option 3: Violate - Means to break or disregard a rule or agreement.

- Option 4: Stately - Describes something dignified or majestic in appearance or manner.

Option: 2, causing vomiting is the nearest synonym for emetic.