General Antonyms:
* Uncontroversial: This is the most direct opposite, meaning something that does not cause debate or disagreement.
* Non-controversial: Similar to uncontroversial, this emphasizes the lack of controversy.
* Harmless: This suggests the topic or idea does not pose any threat or offense.
* Innocuous: Similar to harmless, this emphasizes the lack of potential to offend or cause problems.
* Unremarkable: This suggests the topic is ordinary and unlikely to attract attention.
More Specific Antonyms:
* Agreed-upon: This emphasizes that there is widespread consensus.
* Accepted: This suggests the topic is widely recognized and acknowledged.
* Standard: This implies the topic is established and widely followed.
* Traditional: This suggests the topic is well-established and has a long history.
* Popular: This indicates that the topic is widely liked and supported.
The best antonym will depend on the specific situation and the nuance you want to convey.