Source : Webster's Revised Unabridged Dictionary (1913)

Mystify \Mys"ti*fy\, v. t. [imp. & p. p. {Mystified}; p. pr. &
   vb. n. {Mystifying}.] [F. mystifier, fr. Gr. ? + L. -ficare
   (in comp.) to make. See 1st {Mystery}, and {-fy}.]
   1. To involve in mystery; to make obscure or difficult to
      understand; as, to mystify a passage of Scripture.

   2. To perplex the mind of; to puzzle; to impose upon the
      credulity of; as, to mystify an opponent.

            He took undue advantage of his credulity and
            mystified him exceedingly.            --Ld.
                                                  Campbell.

Source : WordNet®

mystify
     v 1: be a mystery or bewildering to; "This beats me!"; "Got me--I
          don't know the answer!"; "a vexing problem"; "This
          question really stuck me" [syn: {perplex}, {vex}, {stick},
           {get}, {puzzle}, {baffle}, {beat}, {pose}, {bewilder},
          {flummox}, {stupefy}, {nonplus}, {gravel}, {amaze}, {dumbfound}]
     2: make mysterious; "mystify the story" [ant: {demystify}]
     [also: {mystified}]