Synonyms of undercover

1 Syllable
creep, stealth, qt
2 Syllables
hidden, veiled, secret, stealthy, stealthiest, hush-hush, covert, stealthier
3 Syllables
concealed, sub-rosa, underground, underneath, lubricious, disguised, covertly, furtive, private, underhand
4 Syllables
cloak-and-dagger, secretive, confidential, hole-and-corner, dirty-dealing, incognito, clandestine, surreptitious
5 Syllables
intelligence