1. Kept secret
   "the plan was kept carefully under wraps"

See also: covert

• autoradiograph
• autoradiographic
• autoradiography
• autoregulation
• autoroute
• autosemantic
• autosexing
• autosomal
• autosomal dominant disease
• autosomal dominant disorder
• autosomal recessive defect
• autosomal recessive disease
• autosome
• autostrada
• autosuggestion
• autotelic
• autotelism
• autotomic
• autotomise
• autotomize
• autotomy
• autotroph
• autotrophic
• autotrophic organism
• autotropism