modified
Secret
hidden, surreptitious, clandestine; see secret 3.
Secretly
privately, surreptitiously, stealthily; see secretly.
See undercover in Webster's New World Roget's A-Z Thesaurus II
Existing or operating in a way so as to ensure complete concealment and confidentiality:
Learn more about undercover
» undercover sentence examples
Also Mentioned In
» cop
» documentary
» espionage
» gore
» guerrilla
» investigator
» operative
» police officer
» policeman
» policewoman
» more results...
Browse entries near undercover
undercoat
undercoating
undercool
undercount
undercover
undercroft
undercurrent
undercurrent (synonyms)
undercut
undercut (synonyms)