SYN: Feeble, infirm, enfeebled, powerless, debile, fragile, incompact, inadhesive, pliant, frail, oft, tender, milk and water, flabby, flimsy, wishy washy, destructible, watery, diluted, imbecile, inefficient, spiritless, foolish, injudicious, unsound, undecided, unconfirmed, irrepressible, wavering, ductile, easy, malleable, unconvincing, inconclusive, vapid, pointless.
ANT: Strong, vigorous, robust, muscular, nervous, powerful, tough, stout, lusty, sturdy, compact, adhesive, resistant, fibrous, hard, indistructible, potent, intoxicating, efficient, spirited, animated, wise, sound, judicious, cogent, valid, decided, determined, unwavering, stubborn, unyielding, inexorable, conclusive, irresistible, forcible, telling.
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KEY: Weaken.
SYN: Debilitate, enfeeble, enervate, dilute, impair, paralyze, attenuate, sap.
ANT: Strengthen, invigorate, empower, corroborate, confirm.
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KEY: Weakness.
SYN: Debility, feebleness, enervation, dilution, impairment, languor, imbecility, infirmity, decrepitude, frailty, faintness, inconclusiveness, worthlessness, want.
ANT: Strength, power, nerve, spirit, renovation, vigor, lustiness, tone, cogency, activity, conclusiveness, efficiency, value, abundance.