turpitude
This term carries a heavy, formal weight, typically reserved for legal proceedings or high-level ethical critiques. It describes a profound lack of integrity that goes beyond a simple mistake or a minor lapse in judgment, suggesting a deep-seated corruption of character. Because of its severity, it is rarely used in casual conversation and instead appears in contexts where a person's moral standing is being officially judged.
In legal terminology, the phrase moral turpitude is a specific standard used to describe crimes that involve dishonesty or a violation of the community's shared ethical standards. As an abstract quality of character, the word is treated as an uncountable mass noun, meaning it does not have a plural form and cannot be counted with numbers.