clandestine
/klænˈdɛst(a)ɪn/ adjective C1- Done or kept in secret, sometimes to conceal an illicit or improper purpose. · clandestine military operations
- Not recognized as a regular member.
From the library
That opening of the door which I had heard after I had returned to my room might mean that he had gone out to keep some clandestine appointment.
Clara described working tirelessly at a local bakery, saving every spare penny to fund clandestine flying lessons at a nearby rural airfield.
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