clandestine
adjective
UK/klænˈdes.tɪn/
US/klænˈdes.tɪn/
Definitions of clandestine adjective
Planned or done in a secret way, often referring to activities that are not officially allowed.
They held clandestine meetings in an abandoned warehouse.
The company came under scrutiny for its clandestine business dealings.
The spies carried out a series of clandestine operations to gather intelligence.