unsoundness russian

• поро́чность

  depravity, viciousness, immorality

  faultiness, unsoundness, fallaciousness

• несостоя́тельность

  insolvency, bankruptcy, failure (of a business)

  unfoundedness, groundlessness, unsoundness, flimsiness

  inability, incompetence, unworkability

  lack of means, impecuniousness, modest means

Examples

• Его аргументы показали полную несостоятельность теории.

  His arguments demonstrated the theory's complete unsoundness.