The word "un-soundnesses" refers to the state of being unstable, insecure, or unreliable. The antonym for this word is stability, soundness or reliability. In any scenario, the opposite of unsoundness leads to trust, confidence, and assurance. For instance, if someone has doubts about investing in a business due to its un-soundnesses, the opposite would be investing in a sound and reliable business. Similarly, if the integrity of a product is in question, the antonym would be a quality product with a good reputation. Therefore, in any situation, relying on the opposite of un-soundnesses would provide a sense of security, confidence, and stability.