covert
/ˈkō-(ˌ)vərt/
adjective
a covert alliance
secret covert stealthy furtive clandestine surreptitious underhanded mean done without attracting observation. secret implies concealment on any grounds for any motive. covert stresses the fact of not being open or declared.
noun
hiding place : shelter
a thicket affording cover for game
a masking or concealing device
noun
one of the coverts of the tail quills