What does the term "unsound" mean?

The term "unsound" typically refers to something that is not solid, not well-founded, or not healthy. In various contexts, it can describe arguments that lack a solid basis, structures that are not physically stable, or mental states that are not healthy. For example, an unsound argument is one that fails to be logically valid or is built on faulty premises, while unsound construction would imply structural weaknesses. By understanding "unsound" in these ways, it encompasses a range of scenarios where integrity, validity, or health is in question. This is why "not solid; not well founded; not healthy" accurately captures the essence of the term.