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

• in-law
• in-line skate
• in-migration
• in-person
• in-service
• in-situ
• in-tray
• in-your-face
• inability
• inaccessibility
• inaccessible
• inaccessibly
• inaccuracy
• inaccurate
• inaccurately
• Inachis
• Inachis io
• inaction
• inactivate
• inactivation
• inactive
• inactively
• inactiveness
• inactivity
• inadequacy