Source : Webster's Revised Unabridged Dictionary (1913)

Bedevil \Be*dev"il\, v. t. [imp. & p. p. {Bedevilled} (?); p.
   pr. & vb. n. {Bedeviling} or {Bedevilling}.]
   1. To throw into utter disorder and confusion, as if by the
      agency of evil spirits; to bring under diabolical
      influence; to torment.

            Bedeviled and used worse than St. Bartholomew.
                                                  --Sterne.

   2. To spoil; to corrupt. --Wright.

Source : WordNet®

bedevil
     v 1: treat cruelly; "The children tormented the stuttering
          teacher" [syn: {torment}, {rag}, {crucify}, {dun}, {frustrate}]
     2: be confusing or perplexing to; cause to be unable to think
        clearly; "These questions confuse even the experts"; "This
        question completely threw me"; "This question befuddled
        even the teacher" [syn: {confuse}, {throw}, {fox}, {befuddle},
         {fuddle}, {confound}, {discombobulate}]
     [also: {bedevilling}, {bedevilled}]

bedevilling
     See {bedevil}