Direct opposites:
* Silence: This is the most basic opposite, meaning to not make any sound at all.
* Listen: This implies focusing on receiving information rather than sending it.
Opposites in specific contexts:
* Write: If you're talking about communicating through language, writing is the opposite of speaking.
* Hide: If you're talking about expressing oneself, hiding your thoughts or feelings is the opposite of speaking.
* Ignore: If you're talking about engaging in conversation, ignoring someone is the opposite of speaking to them.
Ultimately, the best opposite word for "speak" depends on the specific situation and the intended meaning.