covert russian

• секре́тно

  secretly, covertly, in secret

• крыто

  covertly, secretly, under cover

• подспу́дно

  latently, subconsciously, implicitly, covertly

• коверко́т

  covert

• подковёрный

  under-the-table, behind-the-scenes, covert, secret

• законспири́рованный

  concealed, covert, secret, undercover, disguised

• засекре́тившийся

  who has gone underground, who has become secret, who has hidden oneself, covert, undercover

• подки́дывающий

  tossing, throwing up, flinging up

  planting (surreptitiously), slipping (in), covertly placing

• подсыла́емый

  being sent in, being dispatched covertly

• скрыва́ющийся

  hiding, concealing oneself, latent, covert

Examples

• Нас посла́ли на секре́тную ми́ссию.We are sent on a covert mission.
• Нас посла́ли на та́йное зада́ние.We are sent on a covert mission.