The term 'casually unconcerned' can be described by two crossword solutions: blase (5 letters) and NOSEY (5 letters). Blase is a French word meaning indifferent or apathetic, while NOSEY means overly curious or intrusive. Together, these words describe someone who is unconcerned and uninterested in the affairs of others, but also not interested in getting involved in their own affairs. This person is content to remain aloof and detached from the world around them.