General antonyms:
* Heeded: This means to pay attention to something and take it into account.
* Acknowledged: This means to recognize or admit the existence of something.
* Noticed: This means to become aware of something.
* Considered: This means to think carefully about something.
More specific antonyms depending on the context:
* Attended to: If you are talking about a task or responsibility, the antonym could be "attended to."
* Responded to: If you are talking about a request or a message, the antonym could be "responded to."
* Addressed: If you are talking about a problem or issue, the antonym could be "addressed."
* Valued: If you are talking about something that was not valued, the antonym could be "valued."
Ultimately, the best antonym for "ignored" will depend on the specific situation.