Occultum, meaning concealment or secrecy.

secrecy, hiding, concealment and mystery.

The antonym of manifesto is concealment or secrecy.

The meaning in English of the Latin verb 'celare' is the following: 'to conceal', 'to hide', or 'to keep secret'. Therefore, the verb' decelare' is the opposite: 'to remove from or take out of concealment, hiding or secrecy'. The form 'decelo' is as the first person subject of the present indicative tense. Therefore, its meaning is as follows: I remove or take [somebody or something] out of concealment, hiding or secrecy.