holier-than-thou /ˌhoʊlijɚðənˈðaʊ/ adjective /ˌhoʊlijɚðənˈðaʊ/
adjective
Learner's 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自命清高的