Based on meaning:
* Subheading: This refers to a smaller heading that comes after the main headline.
* Body copy: This refers to the main text of an article, the content that comes after the headline.
* Footnote: This is a small note at the bottom of a page that provides additional information.
* Subtext: This refers to an underlying or implicit meaning, the opposite of being clearly stated as a headline.
Based on function:
* Conclusion: This refers to the end of a piece of writing, the opposite of the beginning where the headline is.
* Unremarkable: This means not noteworthy, the opposite of something that would make a headline.
Consider the specific context:
* If you're talking about the size or prominence of text, then small print might be an antonym.
* If you're talking about the importance of the information, then unimportant or trivial might be appropriate.
Ultimately, the best antonym for "headline" will depend on the specific situation.