The phrase "rare shrewdness" can refer to a person's exceptional intelligence, wit, or ability to make cunning decisions. There are several synonyms for this phrase that can be used to describe someone who possesses such qualities. Some of these synonyms include astuteness, acumen, discernment, intelligence, sagacity, perception, and perspicacity. Each of these words conveys a sense of sharpness and an ability to make smart choices. Someone who has rare shrewdness can be described as someone who is insightful and able to see through complex issues quickly. Whether in business, politics, or personal relationships, rare shrewdness is a valuable asset that can set someone apart from the rest.