Adjektive
hidden {relations}
latent [ more latent ; most latent ]
secret [ more secret ; most secret]
stealthy {law}
مُسْتَتِر {قانون}
unseen [ more unseen ; most unseen]
...
clandistine {econ.}
مستتر {اقتصاد}
Noun
occult {relig.}
مستتر {دين}
incognito [pl. incognitos]