Here's "couldn't care less". Notice that it appeared in 1946 while "could care less" appeared in 1996 in Literature.
(d) Colloq. phr. (I, etc.) couldn't care less : (I am, etc.) completely uninterested, utterly indifferent; freq. as phr. used attrib. Hence couldn't-care-less-ness.
1946 A. Phelps (title) ‘I couldn't care less.’
1947 B. Marshall Red Danube vi. 53 The couldn't-care-less boys, the chaps who imagined that now that the war was over there was no need for further effort.
1947 People 22 June 2/4 If I suggest that it should be good because the book was by a top-line author she simply couldn't care less.
1955 Ess. in Crit. 5 76 Exhibiting a vulgar couldn't-carelessness.
1957 F. King Man on Rock iv. 120 The phrase he most used was ‘I couldn't care less’: which seemed to sum up his character.
1965 Times Lit Suppl. 25 Nov. 1083/1 The couldn't-care-less attitude of people with little to lose.
(d) Colloq. phr. (I, etc.) couldn't care less : (I am, etc.) completely uninterested, utterly indifferent; freq. as phr. used attrib. Hence couldn't-care-less-ness.
1946 A. Phelps (title) ‘I couldn't care less.’
1947 B. Marshall Red Danube vi. 53 The couldn't-care-less boys, the chaps who imagined that now that the war was over there was no need for further effort.
1947 People 22 June 2/4 If I suggest that it should be good because the book was by a top-line author she simply couldn't care less.
1955 Ess. in Crit. 5 76 Exhibiting a vulgar couldn't-carelessness.
1957 F. King Man on Rock iv. 120 The phrase he most used was ‘I couldn't care less’: which seemed to sum up his character.
1965 Times Lit Suppl. 25 Nov. 1083/1 The couldn't-care-less attitude of people with little to lose.
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