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

See also: covert

• inhospitable
• inhospitableness
• inhospitably
• inhospitality
• inhuman
• inhuman treatment
• inhumane
• inhumanely
• inhumaneness
• inhumanity
• inhumanly
• inhumation
• inhume
• inhumed
• Inigo Jones
• inimical
• inimically
• inimitability
• inimitable
• inimitableness
• inimitably
• inion
• iniquitous
• iniquitously
• iniquity