Similar word to unmanning:

abash, blow out, blow up, chill, cripple, damp, dampen, daunt, debilitate, deject, disarrange, disconcert, discountenance, discourage, dishearten, disorder, disorganize, disparage, dispirit, disturb, embarrass, enfeeble, get to, jumble, muddle, nonplus, psych out, rattle, sap, send up, shake, snarl, take apart, take steam out, undermine, unglue, unman, unsettle, unzip, upset, weaken


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