The term 'hard to get close to' can be summarized by the word 'ALOOF', which is a five-letter word. ALOOF is an adjective that describes someone who is distant, unapproachable, and indifferent to others. It is often used to describe someone who is not interested in forming relationships or engaging with people. This term is often used to describe someone who is difficult to get close to because of their lack of interest in connecting with others.