While both "indifferent" and "apathetic" describe a lack of interest or concern, there's a subtle but important difference. "Indifferent" suggests a neutral feeling; you neither like nor dislike something. "Apathetic," however, implies a stronger lack of feeling – a passivity or lack of energy, even to the point of not caring about things that should matter. Think of it this way: someone indifferent to the color of their socks might not have a strong preference, but someone apathetic about their socks might not even care enough to put them on!
Here are some example sentences to illustrate the difference:
Notice how "indifferent" describes a lack of preference, while "apathetic" describes a more profound lack of feeling, energy, and concern. The apathetic person might be described as emotionally numb.
Happy learning!