adjective
characterized by an attitude of moral superiority
preposition
used to compare someone's behavior or attitude unfavorably with one's own
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She often comes across as holier-than-thou in her lectures on morality.
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Don't be so holier-than-thou just because you go to church every Sunday.
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Stop acting all holier-than-thou, nobody likes a self-righteous attitude.
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His holier-than-thou attitude towards others only serves to alienate him from those around him.