The phrase "more subrosa" refers to something that is kept secret or hidden. Therefore, antonyms for this phrase could be words like "openly," "publicly," or "transparently." Other possible antonyms could include "overt," "forthright," or "blatant." All of these words imply a lack of secrecy, in contrast to the covert nature of something that is subrosa. Additionally, words like "known," "revealed," or "unveiled" could also be considered antonyms for "more subrosa," as they all suggest that something has been made known or exposed rather than kept hidden.