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

• Entelea
• entelechy
• entellus
• entente
• entente cordiale
• enter
• enter into
• enter key
• enter upon
• enteral
• enteric
• enteric bacteria
• enteric fever
• enteric-coated aspirin
• enterics
• entering
• enteritis
• enterobacteria
• Enterobacteriaceae
• enterobiasis
• Enterobius
• Enterobius vermicularis
• enteroceptor
• enterokinase
• enterolith