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Definitions of unconcerned:
adjective: not occupied or engaged with
Example: "Readers unconcerned with style"
adjective: easy in mind; not worried
Example: "The prisoner seems entirely unconcerned as to the outcome of the examination"
adjective: lacking in interest or care or feeling
Example: "The average American...is unconcerned that his or her plight is the result of a complex of personal and economic and governmental actions...beyond the normal citizen's comprehension and control"