Clandestine implies stealth and secrecy to the concealment of an frequently unlawful or poor purpose: "The gold was turning out to be so plan that he'd stopped being clandestine about it" (Jennifer Egan). Britannica Dictionary definition of SECRET 1 : held hidden from others : recognised to just a few https://gemfive.com/understanding-tantric-massage-a-journey-to-holistic-wellness/