shyster
Concise Oxford English Dictionary © 2008 Oxford University Press:
shyster/ˈʃʌɪstə(r)/
▶noun informal a person, especially a lawyer, who uses unscrupulous methods.
– origin C19: said to be from Scheuster, the name of a lawyer, perh. reinforced by Ger. Scheisser ‘worthless person’.
'shyster' also found in these Oxford entries:

