holier–than–thou
/ˌhoʊlijɚðənˈðaʊ/
adjective
/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