This word is very interesting too, the special word for Kali-Yuga, which is notorious for abundant religious kinks and abnormalities.
The artha is not only "impostors", but designates all religiously feeble pashus in Kali-Yuga: religious sellers under the guiese of advanced yogins, "megaphones" of false doctrines under the guise of yoga and etc.
Another interesting Sanskrit word with "KU" prefix is कुवाद (kuvAda) which refers to guru offenders and fault-finders (there is a billion of them in Kali-Yuga too).
