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1. Not accessible to view
   "concealed damage";
   - hidden, out of sight
    
2. Hidden on any grounds for any motive
   "a concealed weapon"; "a concealed compartment in his briefcase"

1. Prevent from being seen or discovered
   - hide
    
2. Hold back; keep from being perceived by others
   "She conceals her anger well";
   - hold back, hold in, disguise

See also: bushwhacking [N. Amer], covert, dark, furtive, hidden, incog [informal], incognito, invisible, obscure, sealed, secret, shady, sneak, sneaking, sneaky, stealthy, surreptitious, unavowed, unseeable

Antonym: unconcealed

Encyclopedia: Concealed