1. Conducted with or marked by hidden aims or methods
   "an undercover investigation"
   - clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, underground

See also: covert

Encyclopedia: Undercover

• Theobid
• Theobroma
• Theobroma cacao
• theobromine
• theocracy
• theocrat
• theocratic
• theodicy
• theodolite
• theodolitic
• Theodor Mommsen
• Theodor Schwann
• Theodor Seuss Geisel
• Theodore Dreiser
• Theodore Dwight Weld
• Theodore Francis Powys
• Theodore Harold White
• Theodore Herman Albert Dreiser
• Theodore Roosevelt
• Theodore Roosevelt Memorial National Park
• Theodore Samuel Williams
• Theodosius
• Theodosius I
• Theodosius the Great
• theogony