If "ask" means to inquire or request information:
* Answer: This is the most direct opposite, as it involves providing information in response to a question.
* Tell: This implies sharing information without being explicitly asked.
* Explain: This involves providing a detailed explanation, often in response to a question.
* Declare: This implies stating something firmly and definitively, often without being asked.
If "ask" means to request something:
* Give: This is the opposite in terms of action, as it involves providing something instead of requesting it.
* Offer: This implies providing something willingly without being asked.
* Refuse: This is the opposite in terms of response, as it involves declining a request.
* Deny: This implies refusing to provide something that is being requested.
Other possible opposites:
* Command: This is the opposite in terms of power dynamic, as it involves giving orders instead of requesting something.
* Demand: This implies requiring something forcefully, instead of asking politely.
The best opposite of "ask" will depend on the specific situation and the intended meaning.