(v. t.) To deprive of nerve, force, or strength; to weaken; to enfeeble; as, to unnerve the arm.

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