Ability
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disability, inefficiency, inability, incapability, ineffectiveness, impairment, debilitation, inefficaciousness, ineffectualness, inadequateness, ineptness, want, inanity, inefficacy, feebleness, awkwardness, inadequacy, incapacity, defectiveness, dulness, ignorance, maladroitness, paralysis, inaptitude, impotence, clumsiness, weakness, incapableness, imbecility, incompetence, ineffectuality, lack, stupidity, disablement, helplessness, Incapacitation, limitation, ineptitude, uselessness, deficiency.