v. 25B6; verb
the virus weakened him terribly : ENFEEBLE, debilitate, incapacitate, sap, enervate, tire, exhaust, wear out; wither, cripple, disable.
she tried to weaken the shock for him : REDUCE, decrease, diminish, lessen, moderate, temper, dilute, blunt, mitigate, soften.
our morale weakened : DECREASE, dwindle, diminish, wane, ebb, subside, peter out, fizzle out, tail off, decline, falter.
the move weakened her authority : IMPAIR, undermine, compromise; invalidate, negate, discredit.