Definition of uninterestedness in US English:

uninterestedness

noun

  • See uninterested

    • ‘The reason of the recreational activities’ insufficiency is students’ uninterestedness.’
    • ‘Maybe what was being tested was the total uninterestedness of the American public.’
    • ‘So, yea, the next portion of the entry was slated for earlier publication but due to my uninterestedness in blogging during the hectic exam period, I pushed it back until now.’
    • ‘Peter is aware of my uninterestedness in the general proceedings.’
    • ‘He refused to answer the first student's question, citing, as I recall, his uninterestedness.’