The word "un-concerned" is used to describe someone who is apathetic or indifferent. Antonyms for this word can either describe someone who cares deeply or someone who is worried or anxious about a particular situation. Some common antonyms for "un-concerned" include "concerned," "worried," "anxious," "involved," "interested," and "caring."
Someone who is concerned is not indifferent but instead actively thinking about a situation or problem. If someone is worried, they may be experiencing anxiety or fear about a situation. Being involved suggests that the person is actively participating in a situation or event rather than being detached from it. Interest suggests curiosity or enthusiasm towards something, while being caring suggests empathy and compassion for others.