1. Antonyms for Blatancy include subtlety, obscurity, ambiguity, beauty, delight, joy and covertness

2. Covert is an adjective, related words are the adverb Covertly and the noun covertness.

3. Synonyms for Confidentiality include secrecy, privacy, concealment, discretion, secretness, clandestineness, secretiveness, covertness, stealth and clandestinity

4. Not permitted by the law or regulations Clandestinely {a} secretly, privately, craftily Clandestinely In a way not permitted by the law or regulations Clandestinely secretly, surreptitiously, covertly Clandestinely In a secret or covert manner clandestineness {i} furtiveness, secretness, covertness