noun, noun which may take the genitive case particle 'no'
secretiveness; cult of secrecy
Describes a person, organization, or policy that keeps things hidden or avoids disclosure. Often used critically.
That company is secretive, and almost no internal information gets out.
The government's secretive response drew criticism.
秘密 is a secret itself; 秘密主義 is the attitude or policy of keeping secrets.
隠蔽 is the act of concealing something, often with a negative connotation of covering up wrongdoing; 秘密主義 is a broader tendency toward secrecy.
Compound of 秘密 (secret) and 主義 (principle, -ism). The exact historical derivation is uncertain, but the word follows a common pattern for abstract attitudes.