Source : Webster's Revised Unabridged Dictionary (1913)

Closemouthed \Close"mouthed`\, a.
   Cautious in speaking; secret; wary; uncommunicative.

Source : WordNet®

closemouthed
     adj : inclined to secrecy or reticence about divulging
           information; "although they knew her whereabouts her
           friends kept close about it" [syn: {close}, {closelipped},
            {secretive}, {tightlipped}]