When it comes to expressing the concept of paying close attention to something, many synonyms can be used. Some of the popular words that can replace "attentive to" include vigilant, alert, watchful, observant, mindful, studious, and perceptive. Each of these words indicates a sense of focus and concentration on the matter at hand. Other synonyms that can be used to replace "attentive to" include conscientious, careful, diligent, scrupulous, and thorough. These words suggest a sense of dedication and thoroughness in paying attention to something. When choosing a synonym for "attentive to," it is important to consider the nuances of each word and choose the most suitable word based on the context.