Antonyms for "pro-claim" include words such as reject, deny, withhold, suppress, and conceal. When we reject or deny something, we actively oppose it or refuse to accept it. Withholding involves keeping something back or not revealing it, while suppressing is the act of preventing or restraining something from being expressed or released. Concealing refers to the act of hiding or covering up something. While "pro-claim" means to announce or declare something publicly, these antonyms imply an intentional effort to keep something secret or hidden. Using these antonyms can provide a broader range of meaning to a sentence and help to convey different nuances of language.