What does "clandestine" mean?

Done or kept in secret, sometimes to conceal an illicit or improper purpose.

What is a synonym for "clandestine"?

Common synonyms include: secret, surreptitious, underground, back door, back-door, backstairs.

Pronounced //klænˈdɛst(a)ɪn//.

/klænˈdɛst(a)ɪn/ adj

adj ·Moderate ·College level

Adjective

1
Done or kept in secret, sometimes to conceal an illicit or improper purpose.
"clandestine military operations"
2
Not recognized as a regular member.

Adjective

"He was suspected of being active in a clandestine movement."

From Latin clandestīnus (“secret, concealed”); compare French clandestin.