feebleness

noun

1. (countable, uncountable)The quality or state of being feeble; debility; infirmity.

   “The traditional bourgeois ethic, puritan or secular, had ascribed [economic failure] to moral or spiritual feebleness rather than to lack of intellect, for it was evident that not much in the way of brains was needed for success in business, and conversely that mere brains did not guarantee wealth and still less ‘sound’ views.”