From lazy +‎ -ness.

• (General American) IPA^(key): /ˈleɪ.zi.nəs/

• Audio (Southern England):

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laziness (countable and uncountable, plural lazinesses)

1. The quality of being lazy
   • 1820, [Walter Scott], chapter IV, in The Abbot.[…], volume I, Edinburgh: […] [James Ballantyne & Co.] for Longman, Hurst, Rees, Orme, and Brown,[…]; and for Archibald Constable and Company, and John Ballantyne,[…], →OCLC, page 85:

     “It is thine own laziness, thou false English blood, that doest nothing but drink and sleep,” retorted the page, “and leaves that lither lad to do the work, that he minds as little as thou.”

   • 2016 March 11, Jennifer Coates, “I Am A Transwoman. I Am In The Closet. I Am Not Coming Out.”, in Medium‎^[1]:

     Generalizing harshly and broadly but implying “you know which ones I mean” is an intellectual and rhetorical laziness that is not allowed to pass anywhere else in these communities.