Warren Moon was appalled by the homework clause the Cardinals put into Kyler Murray's contract this month ... calling it not only "embarrassing," but a "slap in the face to all African-American quarterbacks."
The Hall of Famer didn't mince words when breaking down his thoughts on the infamous addendum to the Arizona star QB's massive new deal -- blasting the Cards for even thinking of the idea in the first place.
In fact, Moon tells TMZ Sports it was so bad, he straight up believes the reasoning for the clause and the wording in it was clouded by racial undertones.