uninterest
noun
un·in·ter·est 
ˌən-ˈin-trəst;
-ˈin-tə-rəst -tə-ˌrest,
-tərst;
-ˈin-ˌtrest
: lack of interest
Example Sentences
Recent Examples on the Web But polls have shown persistent resistance and uninterest in getting the vaccine among a high number of Republicans. 
Maeve Reston, CNN, 28 Apr. 2021
Maeve Reston, CNN, 28 Apr. 2021 Word History
First Known Use
1842, in the meaning defined above