Source : Webster's Revised Unabridged Dictionary (1913)

Devitalize \De*vi"tal*ize\, v. t.
   To deprive of life or vitality. -- {De*vi`tal*i*za"tion}, n.

Source : WordNet®

devitalize
     v : sap of life or energy; "The recession devitalized the
         economy" [syn: {devitalise}] [ant: {vitalize}]