Webster's English Dictionary

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unnerve

un.nerve \.*n-'n*rv, '*n-\ vt 1: to deprive of courage, strength, or 
   steadiness  2: to cause to become nervous : UPSET  deprive of vigor. 
   UNNERVE implies marked often temporary loss of courage, self-control, or 
   power to act; ENERVATE suggests a gradual physical or moral weakening (as 
   through luxury or indolence) until one is too feeble to make an effort; 
   UNMAN implies a loss of manly vigor, fortitude, or spirit; EMASCULATE 
   stresses a depriving of characteristic force by removing something 
   essential SYN syn UNNERVE, ENERVATE, UNMAN, EMASCULATE mean to