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

• chiromantic
• Chiron
• Chironomidae
• Chironomus
• chiropodist
• chiropody
• chiropractic
• chiropractor
• Chiroptera
• chiropteran
• chirp
• chirper
• chirpily
• chirpiness
• chirpy
• chirr
• chirrup
• chirurgeon
• chirurgical
• chisel
• chisel in
• chisel steel
• chisel-like
• chiseled
• chiseler