THESAURUS
debilitate
abate, afflict, attenuate, beat, blunt, bugger, burn out, cramp, cripple, damp, dampen, de-energize, deaden, derange, devitalize, disable, disenable, disorder, do in, do up, drain, dull, enervate, enfeeble, eviscerate, exhaust, extenuate, fag, fag out, fatigue, flag, frazzle, gruel, hamstring, harass, hors de combat, hospitalize, hurt, inactivate, incapacitate, indispose, invalid, jade, kibosh, knock out, knock up, lame, lay low, lay up, maim, mar, mitigate, overfatigue, overstrain, overtire, overweary, poop, poop out, prostrate, put, queer, queer the works, rattle, reduce, sabotage, sap, shake, shake up, sicken, soften up, spike, spoil, tire, tire out, tire to death, tucker, unbrace, undermine, unfit, unman, unnerve, unstrengthen, unstring, use up, weaken, wear, wear down, wear on, wear out, weary, wilt, wind, wing, wreck
ROGET THESAURUS
debilitate
Weakness
VB
be weak, drop, crumble, give way, totter, tremble, shake, halt, limp, fade, languish, decline, flag, fail, have one leg in the grave, render weak, weaken, enfeeble,
debilitate, shake, deprive of strength, relax, enervate, eviscerate, unbrace, unnerve, cripple, unman, cramp, reduce, sprain, strain, blunt the edge of, dilute, impoverish, decimate, extenuate, reduce in strength, reduce the strength of, mettre de l'eau dans son vin.