Unnerve

Verb

 * 1) To deprive of nerve, force, or strength; to weaken; to enfeeble.
 * to unnerve the arm
 * 1) To upset.
 * I was greatly unnerved by this.

Derived terms

 * unnervingly

Thesaurus
abate, affright, agitate, alarm, attenuate, blunt, castrate, cramp, cripple, crush, curdle the blood, damp, dampen, dash, deaden, debilitate, demasculinize, demoralize, desex, desexualize, devitalize, discomfit, disconcert, dismay, disquiet, dull, effeminize, emasculate, enervate, enfeeble, etiolate, eviscerate, exhaust, extenuate, faze, fluster, fright, frighten, funk, gruel, horripilate, intimidate, knock down, lay low, make one tremble, mitigate, overcome, perturb, prostrate, psych out, raise apprehensions, rattle, reduce, ruffle, sap, scare, shake, shake up, soften up, spook, stagger, startle, sterilize, stun, stupefy, unbrace, undermine, undo, unman, unsettle, unstrengthen, unstring, upset, weaken