IPA: /ˌmɔːrəˈlɪstɪkli/
KK: /mɔːrəlɪstɪkli/
In a way that emphasizes moral principles or values, often in a judgmental or self-righteous manner.
She spoke moralistically about the importance of honesty in all aspects of life.
Moralistically → It is formed from "moral" (from Latin "moralis", meaning pertaining to manners or ethics) and the suffix "-istically" (meaning in a manner relating to). The word "moralistically" means in a manner that pertains to ethics or moral principles.
Think of 'moral' relating to ethics and 'istically' meaning in a certain way — so moralistically means acting in a way that is ethical.