covertly russian

• секре́тно

  secretly, covertly, in secret

• негла́сно

  secretly, unofficially, privately, covertly

• крыто

  covertly, secretly, under cover

• подспу́дно

  latently, subconsciously, implicitly, covertly

• подки́дывающий

  tossing, throwing up, flinging up

  planting (surreptitiously), slipping in, covertly placing

• подсыла́емый

  being sent in, being dispatched covertly

Examples

• Шпион, выведывающий планы врага, работал скрытно и осторожно.

  The spy ferreting out the enemy’s plans worked covertly and cautiously.