1. secret, secrecy, confidentiality, privacy

noun (common) (futsuumeishi) adjectival nouns or quasi-adjectives (keiyodoshi) nouns which may take the genitive case particle 'no'

2. mystery

noun (common) (futsuumeishi)

3. secret (e.g. to success)

noun (common) (futsuumeishi)

4. esoteric teachings

noun (common) (futsuumeishi) Buddhism