As an adjective shysterish
is like a shyster; fraudulent, disreputable, dishonest.
As a noun shysterism is
the behavior and activities of shysters.
As nouns the difference between shyster and shysterism
is that shyster
is someone who acts in a disreputable, unethical, or unscrupulous way, especially in the practice of law and politics while shysterism
is the behavior and activities of shysters.