The phrase "in a subtle way" means in a quiet, unobtrusive or indirect manner. It is used to describe something that is done or said without making too much fuss or drawing attention to oneself. For example, if someone compliments you on your new hairstyle in a subtle way, they might say "I like the change" instead of "You look amazing". The idea behind this phrase is to convey that something was achieved or done with grace and finesse without making it too obvious.