This shrewd one is not a crafty person. Shrewdness here is connected with knowledge and is associated with a prudent person, who thinks things out before acting.
एखाद्या शहाण्या मनुष्याची अन्यायीपणे टीका केली जाते किंवा अपमानही केला जातो तेव्हा तो आपल्या जिभेवर ताबा ठेवतो.