The word for today is…
clandestine (adjective) –
marked by, held in, or conducted with secrecy
Source : Merriam -Webster
Etymology : In 1658, the English poet John Milton wrote of “clandestine Hostility cover’d over with the name of Peace.” Three and a half centuries later we use clandestine in much the same way. The word is often used as a synonym of secret and covert, and it is commonly applied to actions that involve secrecy maintained for an evil, illicit, or unauthorized purpose. It comes to us by way of Middle French from Latin clandestinus, which is itself from clam, meaning “secretly.”
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