Perspicaciously is an adverb that refers to the ability to understand things quickly and accurately, often by using one's intelligence, insight, and intuition. Synonyms for perspicaciously can include astutely, shrewdly, ingeniously, sharply, keenly, perceptively, sagaciously, and cleverly. These words all suggest a level of intelligence and discernment that allows one to make insightful and well-informed decisions. Other synonyms that could be used to describe perspicaciously might include wisely, judiciously, thoughtfully, prudently, and discerningly. These words all suggest a level of wisdom and experience that enables one to make wise and informed choices.