adj.

1. Performed or occurring in secret: an undercover investigation.
2. Engaged or employed in spying or secret investigation: undercover FBI agents.

adjective

Existing or operating in a way so as to ensure complete concealment and confidentiality: clandestine, cloak-and-dagger, covert, huggermugger, secret, sub rosa. Informal hush-hush. Idioms: under wraps. See show/hide.

adj

Definition: secret, spy
Antonyms: known, open, public

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Dansk (Danish)
adj. - hemmelig
adv. - hemmelig, bestikkelses-

Nederlands (Dutch)
geheim (agent/spion)

Français (French)
adj. - clandestin
adv. - clandestinement

Deutsch (German)
adj. - getarnt, geheim
adv. - geheim

Ελληνική (Greek)
adj. - μυστικός, αφανής, κρυφός

Italiano (Italian)
clandestino

Português (Portuguese)
adj. - secreto

Русский (Russian)
тайный, нелегальный

Español (Spanish)
adj. - secreto, clandestino, confidencial
adv. - en secreto, en forma clandestina, en forma confidencial

Svenska (Swedish)
adj. - hemlig

中文（简体） (Chinese (Simplified))
秘密从事的, 从事间谍活动的, 秘密的, 暗中, 秘密地

中文（繁體） (Chinese (Traditional))
adj. - 秘密從事的, 從事間諜活動的, 秘密的
adv. - 暗中, 秘密地

한국어 (Korean)
adj. - 비밀로 활동하는, 내밀한
adv. - 내밀하게

日本語 (Japanese)
adj. - 秘密の, スパイ活動をする

العربيه (Arabic)
‏(صفه) خفي, سري, (عمليات ماليه) خفيه‏

עברית (Hebrew)
adj. - ‮חשאי, סודי, עוסק בריגול‬
adv. - ‮בגניבה‬

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