The word "declarable" means something that can be declared or stated. Its antonyms include "undetectable," which means unable to be noticed or discovered, "indefinable," meaning incapable of being defined, and "unmentionable," which means not fit to be spoken about. Other antonyms for "declarable" include "secret," which means kept hidden from knowledge or view, "unrevealable," describing something that cannot be revealed, and "unconfessed," meaning not acknowledged or admitted. The antonyms for "declarable" showcase words that relate to things that can't be disclosed, expressed or revealed, unlike the original word.