Source : Webster's Revised Unabridged Dictionary (1913)

Double-tongued \Dou"ble-tongued`\, a.
   Making contrary declarations on the same subject; deceitful.

         Likewise must the deacons be grave, not double-tongued.
                                                  --1 Tim. iii.
                                                  8.

Source : WordNet®

double-tongued
     adj : marked by deliberate deceptiveness especially by pretending
           one set of feelings and acting under the influence of
           another; "she was a deceitful scheming little thing"-
           Israel Zangwill; "a double-dealing double agent"; "a
           double-faced infernal traitor and schemer"-
           W.M.Thackeray [syn: {ambidextrous}, {deceitful}, {double-dealing},
            {duplicitous}, {Janus-faced}, {two-faced}, {double-faced}]