What is the antonym for placard?

There isn't a single perfect antonym for "placard," as the word's meaning depends on context. However, depending on how "placard" is being used, some potential antonyms could be:

* If "placard" refers to a sign:

* Absence: If someone removes a placard, there is an absence of a placard.

* Blank: If a placard is replaced with a blank surface, it could be considered the opposite.

* Hidden: If the placard is concealed, it's the opposite of being visible.

* If "placard" refers to a public display of protest or support:

* Silence: If a placard is removed, it could be seen as a sign of silence or lack of protest.

* Apathy: The opposite of a placard might be a lack of engagement or apathy.

* Agreement: If a placard is meant to express dissent, the opposite could be a sign of agreement.

Ultimately, the best antonym for "placard" depends on the specific situation and what you're trying to convey.