To study at careful means to examine or research something with great attention and concentration. Synonyms for this phrase include scrutinize, analyze, inspect, survey, peruse, review, investigate, and explore. All of these words imply a deliberate and methodical approach to understanding a subject or situation. When we study at careful, we are striving to comprehend all the details, nuances, and implications of what we are examining. Whether we are studying a text, a problem, a plan, or a person, we need to be careful in our observation and reflection in order to gain a thorough and accurate understanding of the matter at hand.