毫不在意

Could not care less indicates complete unconcerned attitude toward certain matters, showing no attention, no reaction or no worries. Those who are indifferent tend to display strong composure in front of many problems and appear cool as cucumbers. However, this is sometimes just a facade. Deep inside they actually have rich feelings, which simply don't show up on the outside. Using this name implies that one tries to present themselves to others as aloof personalities, without revealing too much of his own thoughts.