Positive reactions:
* Applause: This is the most common antonym, signifying approval and admiration.
* Cheering: Similar to applause, but usually more enthusiastic and often accompanied by shouts.
* Standing ovation: The highest form of audience approval, where people stand up and applaud.
* Bravos: A shout of approval, often used in opera and classical music.
* Shouting "Encore!": Demanding a repeat performance, indicating appreciation.
Neutral reactions:
* Silence: A complete absence of any reaction, indicating indifference.
* Indifference: Lack of interest or emotion.
* Ignoring: Not paying attention to the performance.
Negative reactions:
* Hissing: A sound of disapproval, often used in theatre.
* Jeering: Making fun of or mocking someone.
* Heckling: Interrupting a performance with rude or insulting comments.
The best antonym for "booing" will depend on the specific situation and the intended meaning.