"Is wise to someone" can be replaced by various synonyms depending on the context. For instance, using the phrase "is sensible" implies that a particular action or decision is rational and logical. "Is prudent" indicates that the action is wise and careful, while "is judicious" suggests that the decision is based on sound judgement and good sense. Other synonyms for "is wise to someone" include "is astute," "is shrewd," "is sagacious," "is insightful," and "is perceptive." All of these terms refer to a level of knowledge and practical wisdom that helps individuals make smart choices and navigate the challenges of life.