"Dummied up" is a phrase that means to keep quiet or withhold information. As such, antonyms for this phrase would include words or phrases that denote speaking out or sharing information. Some potential antonyms could include expressions like "speaking out," "sharing," "disclosing," "revealing," "inquiring," and "communicating." Other antonyms might include words such as "chatty," "eloquent," "articular," "unreserved," and "forthcoming." By using these antonyms, individuals can convey the opposite of the idea of "dummied up" and instead express a willingness to speak out and share their perspectives freely.