A better definition according to USCIS
https://www.uscis.gov/policy-manual/volume-12-part-f-chapter-5
Crime involving moral turpitude” (CIMT) is a term used in the immigration context that has no statutory definition. Extensive case law, however, has provided sufficient guidance on whether an offense rises to the level of a CIMT. The courts have held that moral turpitude “refers generally to conduct that shocks the public conscience as being inherently base, vile, or depraved, contrary to the rules of morality and the duties owed between man and man, either one’s fellow man or society in general.”[3]
Whether an offense is a CIMT is largely based on whether the offense involves willful conduct that is morally reprehensible and intrinsically wrong, the essence of which is a reckless, evil or malicious intent. The Attorney General has decreed that a finding of “moral turpitude” requires that the perpetrator committed a reprehensible act with some form of guilty knowledge.[4]
The officer should consider the nature of the offense in determining whether it is a CIMT.[5] In many cases, the CIMT determination depends on whether the relevant state statute includes one of the elements that involves moral turpitude. For example, an offense or crime may be a CIMT in one state, but a similarly named crime in another state may not be a CIMT because of differences in the definition of the crime or offense. The officer may rely on local USCIS counsel in cases where there is a question about whether a particular offense is a CIMT.