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holier–than–thou

holier–than–thou /ˌhoʊlijɚðənˈðaʊ/ adjective
holier–than–thou
/ˌhoʊlijɚðənˈðaʊ/
adjective
Britannica Dictionary definition of HOLIER–THAN–THOU
[more holier–than–thou; most holier–than–thou] disapproving
: having or showing the annoying attitude of people who believe that they are morally better than other people